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Joey Porter played his final game for the Pittsburgh Steelers in the 2006 season. Clark Haggans was gone from the team a year later.

The veteran outside linebackers, now 34 years old, are scheduled to start for Arizona against their former team Sunday, a reflection of how the teams have drafted for defense recently.

In 2007, the year coaches Ken Whisenhunt and Russ Grimm left Pittsburgh's staff for the Cardinals, the Steelers drafted mainstay linebackers Lawrence Timmons and LaMarr Woodley. Much of the Steelers' defense is aging, but Timmons and Woodley are ascending young players approaching their primes. Woodley represents the type of outside linebacker the Cardinals have coveted, but have yet to land.

Arizona takes criticism for drafting tackle Levi Brown over running back Adrian Peterson in 2007, but decisions made in addressing the defense stand out with Timmons and Woodley coming to town. That was the year Arizona used a second-round choice for defensive lineman Alan Branch, now reborn in Seattle after falling short of expectations in Arizona. The Cardinals used their third-round pick in 2007 on linebacker Buster Davis, who was cut as a rookie.

The Cardinals bounced back in 2008 by drafting defensive end Calais Campbell in the second round. Two other early defensive choices that year -- Dominique Rodgers-Cromartie for Arizona and Bruce Davis for Pittsburgh -- have changed teams. Rodgers-Cromartie went to a Pro Bowl with the Cardinals before the team traded him to Philadelphia. Davis, a third-round choice, was released after one season.

In 2009, the Steelers landed defensive lineman Ziggy Hood, who has played more than 70 percent of the defensive snaps this season. Arizona drafted Cody Brown, a second-round choice who never contributed, before selecting defensive backs Rashad Johnson (starting for the injured Kerry Rhodes) and Greg Toler (incumbent starter now on injured reserve).

The Cardinals have initially fared better than the Steelers in drafting for defense in 2010. They got nose tackle Dan Williams, ascending inside linebacker Daryl Washington and pass-rushing project O'Brien Schofield. The Steelers drafted linebacker Jason Worilds, who has made a positive contribution on special teams without factoring into the defense yet.

The chart shows defensive players the teams drafted in the first three rounds from 2007-09.

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SANTA CLARA, Calif. -- Patrick Willis set a career high with six sacks last season. The four-time Pro Bowl choice has 10 sacks over the past two seasons, tied with Pittsburgh's Lawrence Timmons among NFL leaders at inside linebacker.

The 49ers' new coaching staff wants more.

"He is very good and better than I thought he was in most areas," new defensive coordinator Vic Fangio said after practice Tuesday. "We need to make him a better blitzer."

Specifically, the 49ers are working with Willis to improve his technique against running backs assigned to account for blitzes. Willis is already a complete inside linebacker with no apparent weaknesses to his game. Rushing the passer generally isn't a priority at his position; most elite pass-rushing linebackers play on the outside. But the 49ers think Willis can become more dynamic, a scary thought for opposing defenses.

"I think it would complete his game, to where not only is he a good cover linebacker and he plays the run well, but he's a threat when we rush him as either the fourth or fifth guy," Fangio said. "He is behind as a blitzer from a know-how standpoint. ... He knows that and is working diligently both on and off the field."

Even the best players can get better. Pushing Willis in this area seems like a no-lose proposition for San Francisco.

The try-hard guy, long revered by NFL fans for overcoming physical limitations with all-out effort, has not been universally loved.

Established veterans with a feel for how to practice during long, demanding regular seasons can become resentful when the try-hard guy's misplaced fury produces unwanted collisions.

So, for the sake of clarity, the try-hard guy is excused from this conversation about pass-rushers so relentless, they wear down opponents over the course of a game.

We're talking about players with enough talent to command significant playing time, many as high draft choices or big-ticket free agents. We're talking about the San Francisco 49ers' Justin Smith, one of two NFC West players to receive votes in ESPN.com's Power Rankings for defensive players. Patrick Willis was the other.

"Justin Smith is a relentless player who wears down opponents by coming after them each and every play," BigBrad184 wrote in response to this item Wednesday morning. "I don't have any stats to back this up, but it seems like he often gets many of his sacks in the fourth quarter because of the fatigue he causes to offensive lineman."

Interesting thought.

"Maybe breaking out Smith's sacks by quarter over the past few years is a project for Sando," BigBrad184 concluded.

Done deal. John Fisher of ESPN Stats & Information responded to my request for the statistical evidence BigBrad184 was seeking. Smith does rank among the NFL leaders for fourth-quarter sacks in recent seasons, but two other NFC West players, including one of Smith's teammates, rank higher on the list.

More on the results in a bit. First, a look at the methodology.

Fisher provided a file with quarter-by-quarter sack totals for every player since 2001. I filtered the information to consider:

• The last three seasons. There was no sense comparing totals for eight-year veterans against players entering the league more recently. At the same time, three seasons was long enough to pile up adequate numbers.
• Players with at least 10 sacks. This reduced qualifying players from 668 to 99, a more manageable number featuring more "name" players.
• Late-game production. I then divided the remaining 99 players' fourth-quarter and overtime sack totals by their total sacks, producing percentages that might tell us which players tend to wear down opponents.

The 49ers' Smith collected 8.5 of his 21.5 sacks in fourth quarters or overtimes since 2008. That worked out to 39.5 percent, which ranked 22nd among the 99 qualifying players.

Philadelphia's Darren Howard, who did not play in 2010, led the way with 75.8 percent of his sacks (11.5 of 16.5) after the third quarter. He was on the Eagles' roster for two of the three seasons in question and never played even half the defensive snaps in either year. But he was highly effective as a situational player, at least when measured by sack totals. Only Jared Allen (15) and Joey Porter (14) had more total sacks after the first three quarters.

There was no way to tell whether players with higher late-game sack percentages had more or better late-game opportunities for reasons unrelated to being relentless. Players operating within superior schemes or alongside better teammates certainly benefited. Overall, players collected more sacks in second and fourth quarters, no surprise given that teams attempted 6,130 additional passes during those quarters over the past three seasons, a likely reflection of two-minute situations.

The San Francisco 49ers' Parys Haralson (52.9 percent) and the St. Louis Rams' Chris Long (48.6 percent) ranked highest in fourth-quarter sack percentage among current NFC West players with at least 10 sacks over the past three seasons. Haralson was seventh in the league. Long was ninth. Former 49er Tully Banta-Cain was 10th (48.4 percent), while Arizona's Joey Porter (44.4 percent), St. Louis' Fred Robbins (44.4 percent), ex-Seahawk Lawrence Jackson (44.0 percent) and current Seahawk Chris Clemons (41.0 percent) ranked among the top 20.

Were these guys merely slow starters? Were they strong finishers? Did they wear down opponents over the course of games? The numbers do not answer those questions definitively, but they provide a starting point for discussion.

I was also interested in seeing which players collected a disproportionate number of sacks earlier in games. They were, at best, tone setters. At worst, they failed to finish or failed to adequately wear down opponents. The previous disclaimers applied to them as well.

As the chart below shows, three of the 10 qualifying players with the lowest percentages of late-game sacks have NFC West roots.

Arizona's Calais Campbell has 5.5 of his 13 sacks in first quarters, but only one in fourth quarters or overtimes. The 49ers' Manny Lawson collected 11 of his 12 sacks in the first three quarters. Darryl Tapp, traded from Seattle to Philadelphia in the deal for Clemons, has 4.5 sacks in each of the first two quarters, but only two in second halves (one after the third quarter).

A few other observations with an eye toward the NFC West:

• Porter (six) and Campbell (5.5) rank among the top seven in most first-quarter sacks. The 49ers' Smith is right behind with five.
• Arizona's Darnell Dockett has nine of his 16 sacks in second quarters. Eight players have more second-quarter sacks over the past three seasons, but all are edge-rusher types. Dockett plays end in a 3-4 scheme.
• Pittsburgh's James Harrison and LaMarr Woodley are a third-quarter nightmare for opposing quarterbacks. Harrison leads the NFL with 15.5 sacks in third quarters. Woodley is second with 12. Former Cardinal Calvin Pace ranks in the top 10 with 7.5.
• Porter and Allen are tied for the most fourth-quarter sacks in the NFL over the past three seasons. Each has 14 (Allen also had one in overtime). DeMarcus Ware and Robert Mathis are next with 13.5, followed by Dwight Freeney and Julius Peppers with 12.5.

Back to the original question: Is the 49ers' Smith a relentless player who wears down opponents, producing fourth-quarter payoffs?

He might be, but he produces well enough across all quarters to transcend the try-hard label and probably even the relentless label as well. He's a beast.

JaMarcus Russell's demise as an NFL player is back in the news, shining light upon the perils of investing millions in unproven prospects.

The 2007 NFL draft was about more than Russell, of course.

That draft also produced Calvin Johnson, Joe Thomas, Adrian Peterson, Patrick Willis, Darrelle Revis and Lawrence Timmons among the top 15 choices.

For as much criticism as the Arizona Cardinals have taken for selecting tackle Levi Brown fifth overall, Brown has started 59 regular-season games, second only to Willis (63) among NFC West draft choices that year. He has also started six playoff games, including a Super Bowl, and coach Ken Whisenhunt expects good things from him.

I've put together a couple charts showing what NFC West teams have gotten from their draft choices that year. More on those in a bit.

First, I've taken a team-by-team look at the players selected, whether they remain with their original teams and how many games each has started for his drafted team.

The 49ers had the best draft among NFC West teams. They also had the most draft capital to work with, selecting twice in the first round. The Seattle Seahawks had no first-rounder that year thanks to the Deion Branch trade, so expectations were lower.

Arizona Cardinals

Total picks: five

Still with team (4): Brown (59), Steve Breaston (26), Ben Patrick (20), Alan Branch (3)

No longer with team (1): Buster Davis (0)

Comment: The Cardinals had fewer total selections than any team in the division. Hitting on Breaston in the fifth round was outstanding, but the Cardinals haven't gotten enough from their top three selections that year. Branch never panned out as a second-rounder. Davis, the third-rounder, didn't make it out of camp. Whisenhunt takes pride in making roster decisions with less regard for draft status. He wasn't going to give Davis or anyone a free pass. That's admirable, but in the bigger picture, Arizona still came up short in this draft.

San Francisco 49ers

Total picks: nine

Still with team (5): Willis (63), Joe Staley (50), Ray McDonald (9), Dashon Goldson (34), Tarell Brown (5)

No longer with team (4): Jason Hill (2), Jay Moore (0), Joe Cohen (0), Thomas Clayton (0)

Comment: Former general manager Scot McCloughan gets credit for selling former coach Mike Singletary on Willis as an elite prospect. That seems odd given Singletary's background as a Hall of Fame linebacker, but the 49ers got the right guy, so the "how" part matters less. That one selection makes this draft the best in the division for 2007. Staley is the starting left tackle. McDonald has been a solid rotation player. Goldson became a starter. All in all, this was a strong draft.

Seattle Seahawks

Total picks: eight

Still with team (2): Brandon Mebane (53), Will Herring (7)

No longer with team (6): Josh Wilson (24), Steve Vallos (8), Mansfield Wrotto (5), Courtney Taylor (4), Jordan Kent (1), Baraka Atkins (0)

Comment: Not having a first-round selection severely hurt this class' overall potential. Wilson seemed like a solid selection in the second round given the playmaking value he offered, but multiple changes in organizational leadership left him on the outside in terms of fit. Mebane was a solid choice in the third round. Vallos and Wrotto remain in the league elsewhere.

St. Louis Rams

Total picks: eight

Still with team (1): Clifton Ryan (27)

No longer with team (7): Adam Carriker (25), Brian Leonard (7), Jonathan Wade (6), Dustin Fry (0), Ken Shackleford (0), Keith Jackson (0), Derek Stanley (0)

Comment: This draft was a disaster for the Rams and made worse by massive organizational changes. On the bright side, the Rams might not have been in position to select Sam Bradford first overall in 2010 without selecting so many non-contributors in 2007.

Now, on to the charts. The first one takes a round-by-round look at the number of starts each team has gotten from its 2007 selections. I have used dashes instead of zeroes to show when teams did not have a selection in a specific round.

The second chart divides the number of starts by the values of the selections each team held, using the draft-value chart.

For example, the value chart said the Seahawks' picks that year were worth 669.2 points, far less than the picks for other NFC West teams were worth. Using this measure, Seattle got more bang for its buck if we valued all starts equally (and we should not value them all equally, but we can still use this as a general guide).

Some of the choices were compensatory and could not be traded, so the chart would not have valued them for trading purposes. I assigned values to them for this exercise, however, because we were not considering the picks for trading purposes.

ESPN.com’s NFL writers rank the top 10 linebackers in the league today. Next week: Top 10 cornerbacks.

San Francisco 49ers linebacker Patrick Willis beat out a strong and diverse field for top billing in ESPN.com's latest positional power rankings.

All eight panelists ranked Willis among their top three, elevating the 26-year-old perennial Pro Bowler above James Harrison and DeMarcus Ware as our No. 1 linebacker in the NFL.

Even 12-time Pro Bowler Ray Lewis, the dominant linebacker of his era, pointed to Willis as a worthy successor to his undisputed reign. Not that Lewis is finished just yet. He placed fifth in the rankings behind Willis, Harrison, Ware and the Green Bay Packers' Clay Matthews. But there was no more complete linebacker than Willis.

"Nobody in the NFL plays their position better than Patrick Willis, and that is saying a lot," said Matt Williamson of Scouts Inc., whose insights helped shape my ballot. "He is as good a linebacker as Peyton Manning is a quarterback, as Andre Johnson is a receiver, as Adrian Peterson is a running back. He has no weaknesses."

Willis, a three-time Associated Press All-Pro first-team selection, is the first 49ers player since Ronnie Lott to earn Pro Bowl honors in each of his first four seasons. Joe Thomas and Peterson are the only other 2007 draft choices with four Pro Bowls.

Apples and oranges: Comparing linebackers from 3-4 schemes to their 4-3 counterparts proved problematic for some panelists. AFC East blogger Tim Graham ranked Ware first among pass-rushers three weeks ago, but only ninth among linebackers.

"Patrick Willis, Brian Urlacher and Ray Lewis would be great linebackers in a 3-4 or a 4-3," Graham explained. "DeMarcus Ware and Cameron Wake might not even be linebackers if they played in Indianapolis, Tennessee or Minnesota. At some point, I had to value elite pass-rushing abilities on my list even though those players aren't universal-type linebackers."

There was room for differing views. ESPN.com's John Clayton and AFC North blogger James Walker ranked Ware first among linebackers and first among pass-rushers. AFC South blogger Paul Kuharsky ranked Ware first among linebackers and second among pass-rushers.

"Separating Ware, Willis and Harrison is like splitting hairs, because it really depends on what you want in a linebacker," said Walker, who went with Ware, Willis and Harrison atop his ballot. "Ware is a slightly better pass-rusher than Harrison, and Willis is a future Hall of Famer in his prime. Age also has to be a consideration if you’re building a defense, and Harrison will be 33 in May. But they're all great."

First things first: Graham and NFC North blogger Kevin Seifert joined me in ranking Willis first. AFC West blogger Bill Williamson had Willis second only to Harrison.

"When I think of linebacker play in the current day, James Harrison pops out," Bill Williamson said. "I think he’s the gold standard of complete linebacker play. Look at his signature play in the Super Bowl against Arizona. That play will forever be part of NFL lore. Patrick Willis, who is also a great player, doesn’t have that play on his résumé. Plus, Harrison is an ornery cuss on the field. The man was born to be a 'backer."

Willis can't match Harrison in Super Bowl memories -- he could use a quarterback, for starters -- but he's not hurting for signature plays:

• There was the time, as a rookie in 2007, when Willis tracked down and tackled Arizona Cardinals wide receiver Sean Morey 62 yards downfield, in overtime, to save the game.
• There was the time in 2008, when Willis picked off Seattle Seahawks quarterback Matt Hasselbeck and weaved his way 86 yards to the tying third-quarter touchdown -- the longest interception return by a linebacker since Willis entered the league.
• There was Willis' crushing hit against the New York Jets' Brad Smith in 2008, the hit that left Hasselbeck with a broken rib in 2009 and the two-game stretch last season when Willis collected 28 tackles despite wearing a cast following in-season hand surgery.

Lewis pointed to Willis when ESPN's Dana Jacobson recently asked him which young linebacker reminded Lewis of himself.

"I just love the way he plays the game," Lewis said. "He plays the game with a fire. He reminds me of myself -- a lot, a lot, a lot."

Unanimous decisions: The top five finishers received votes from all eight panelists. The gaps between highest and lowest votes fell between four and seven places for all but Willis, who ranked no lower than third.

Seifert ranked Lewis third. I had Lewis 10th and feared I might be measuring him against himself. No list of top linebackers would be complete without him, I thought, but a younger generation is taking over.

Hugs for Suggs: Lewis' teammate, Terrell Suggs, finished just out of our top 10 despite getting a No. 5 ranking from Kuharsky.

"I unabashedly love Suggs, and frankly would have placed him higher if I thought there was any way he needed help to crack the top 10," Kuharsky said. "To me, there is a great deal of subjectivity in ranking this position when mixing guys from 4-3s and 3-4s, so I did a lot of know-them-when-I-see-them ranking. Suggs is absolutely a top-10 guy to me."

Clayton, Seifert, Graham and I did not list Suggs on our ballots while searching for the right mix of 3-4 and 4-3 talent.

Fit to be tied: The players tied for ninth on our list illustrate the varied criteria for the position. Kansas City's Tamba Hali is a pure pass-rusher in the Chiefs' 3-4 defense. Carolina's Jon Beason is a traditional 4-3 linebacker with the versatility to play multiple spots. He changed positions twice in 2010.

Beason peaked at No. 5 on my ballot. NFC South blogger Pat Yasinskas had Beason sixth and considered ranking him higher.

"There was a time when I would have ranked Beason in the same echelon as Willis," Yasinskas said. "I think he has a chance to re-emerge if Carolina can put a better team on the field, particularly by getting better at defensive tackle and keeping blockers off Beason. If that happens, I think Beason can be as good as any linebacker in the league."

Youth on his side: New England's Jerod Mayo appeared on six of eight ballots, ranking sixth overall between Lewis and Urlacher. At 25, Mayo was one of two linebackers younger than Willis to earn a spot among the top 10. Matthews, 24, was the other. Graham ranked Mayo third.

"Nose tackle Vince Wilfork might be the anchor of the Patriots' defense, but Mayo is the one who ties their defense together," Graham said. "Mayo is a tackling machine who compensates for shortcomings at outside linebacker and injuries along the defensive line. He would be a star in any system."

On an island: Four linebackers received a single vote. That list featured Brian Orakpo (Clayton), Lance Briggs (Seifert), London Fletcher (Walker) and Wake (Graham).

Best doesn't mean most valuable: Matt Williamson called linebacker the toughest position to evaluate. I'll close by passing along a few of his thoughts:

• "Willis is so exceptional it would be a coin flip with Ware. Willis has no weaknesses, but if I were a general manager, I would take Ware because pass-rushers are so hard to find. You can get away with a C-level middle linebacker and still have a good defense. You can have a two-down run-stopper and pull him out in nickel."
• "Ray Lewis would not be in my top five at this point. For his age, he is still exceptional and a borderline Pro Bowler, but he doesn't run like he did. I remember when I was with the Browns, I looked at every report the team had written since 1999 and Lewis had the highest grade ever given out. He was nearly perfect."
• "Hali is a one-trick pony, a pass-rusher, but he is great at it -- as good as any pass-rusher in the league."
• "Beason is like Patrick Willis, but he is 95 percent of him. He can play outside, inside, he's smart -- but there is so little around him that people don't realize how good he is."
• "Pass rushing is Clay Matthews' greatest gift, but he is the prototypical outside linebacker. He's a great technician and way more explosive and athletic than people realize. He's good in coverage, not great, but they line him up all over."
• "London Fletcher is underrated, but not in this conversation. How Beason is to Willis, Fletcher is to Lewis. He is smaller and slower than Lewis, good among older guys."
• "Brian Urlacher is still a really good player, but the top 10 might be a stretch. I would take him ahead of Lewis, behind Beason and Willis among 'Mike' 'backers. He is good in coverage. People forget that he was a safety at New Mexico. He doesn't run like he used to and is just not as dynamic as he was in the day."
• "The Steelers have the best linebackers in the league. LaMarr Woodley is very strong and in that conversation too. Definitely top 15. Harrison is great against the run, extremely strong and one of the few linebackers in the league that is a difference-maker from an attitude standpoint. He brings attitude to the table like a Jack Lambert or a Dick Butkus or a Ray Lewis type. He is feared. He is one of the best leverage players in the league, great in pursuit, tenacious as hell. The other guy to know about is Lawrence Timmons. He will be spectacular."

Ken Whisenhunt is right when he says Levi Brown takes more criticism as a high draft choice than he would take as someone selected later in the process.

That's the way it works. The highest picks in a draft class should outperform their peers.

The Arizona Cardinals don't need anyone to remind them that they selected Brown over some All-Pro performers, including Adrian Peterson and Patrick Willis. But it's not as though Brown, a player with 56 consecutive regular-season starts, qualifies as a flat-out bust, either. He moved to left tackle from the right side last season and will stay there.

"He improved last year," Whisenhunt said this week from the NFL owners meeting in New Orleans. "As a left tackle, it's not an easy position to move from right tackle. He will continue to get better. He is a talented football player. The biggest thing he has struggled with is the consistency of his play. But a lot of times you are under the microscope more because you were the fifth pick in the draft."

I would rank Brown, chosen fifth overall in 2007, somewhere around 20th out of 32 first-round picks that year.

Brown has obviously or arguably outperformed the following first-round selections from 2007: JaMarcus Russell, Jamaal Anderson, Ted Ginn Jr., Amobi Okoye, Adam Carriker, Justin Harrell, Jarvis Moss, Aaron Ross, Reggie Nelson, Brady Quinn, Anthony Gonzalez and Craig Davis. Gaines Adams, chosen fourth that year, passed away after Tampa Bay traded him to Chicago.

The following first-rounders from 2007 have obviously or arguably outperformed Brown: Calvin Johnson, Joe Thomas, LaRon Landry, Adrian Peterson, Patrick Willis, Marshawn Lynch, Darrelle Revis, Lawrence Timmons, Leon Hall, Michael Griffin, Dwayne Bowe, Brandon Meriweather, Jon Beason, Anthony Spencer, Robert Meachem, Joe Staley, Ben Grubbs and Greg Olsen.

"The reason we drafted Levi where we did was because we had him rated high enough to go in that position, but we also felt like we had to develop our offensive line and defensive line at that point, because that is where the most critical component of your team," Whisenhunt said. "That is the only way you are going to have a chance to compete. Levi has been a good player. He is often criticized, but I think that comes with being the fifth pick, and I don't understand how you evaluate offensive linemen, because they are not catching passes or running touchdowns in."

Whisenhunt said he thought Brown can and will become an "outstanding" player.

"Any time an offensive lineman gets drafted that high, especially in a fantasy football world where people want you to get dynamic playmakers, you are going to face some kind of criticism," Whisenhunt said. "I have to give Levi some credit. As tough as it's been, he hasn't let it affect him. He has continued to work and get better and I think this will be a big year for him. This is a chance for him to show that he can play this position very well."