This group is subject to more change during the season than perhaps any other position. You never quite know how chemistry will develop, and in these rankings, you really have to rely heavily on experience, similar to quarterbacks. It's not the only factor, but you have to acknowledge that it's a major one.
So, here's how I rank them:
Oklahoma State's Levy Adcock, 73, is among the Big 12's best returning offensive linemen.
1. Oklahoma State: This is a no-brainer. The Cowboys broke in four new starters last season, but became a big reason why OSU's offense was one of college football's best. Despite throwing 532 passes, third-most in the Big 12, the group surrendered just 10 sacks. All five starters return, too. Running back Kendall Hunter also rushed for more than 1,500 yards. Right tackle Levy Adcock headlines the unit as the league's best overall lineman.
2. Baylor: The Bears might be a bit of a surprise here, but Baylor's strong skill-position talents wouldn't look nearly as good without this group, which lost a first-round pick at left tackle in Danny Watkins. However, Philip Blake is one of the league's best centers and four starters return from a line that helped Baylor finish second in the Big 12 last season in yards per carry, just behind Nebraska but nearly a half-yard more than Oklahoma State, the third-place team.
3. Missouri: The Tigers suffered a big loss in center Tim Barnes, a three-year starter and the offensive line's leader, but they return four starters from last season line and have the most career starts on the line of any team in the Big 12, with 105, which ranks 11th nationally.
4. Texas A&M: A&M's rising sophomore tackles, Luke Joeckel and Jake Matthews, had to learn on the go last season, but their development should be fun to watch this season on an offensive line blocking for the Big 12's best overall collection of skill-position talents. The line returns four starters, replacing only center Matt Allen.
5. Oklahoma: The Sooners' goal-line problems last season cost them a game at Texas A&M, but this line was very solid the rest of the season and has plenty of upside. Likely starter Jarvis Jones won't be available until perhaps October, so the Sooners will turn to touted redshirt freshman Daryl Williams at right tackle in the interim. Center Ben Habern and tackle Tyler Evans add a lot of experience.
6. Texas Tech: Tech boasts one of the Big 12's best guards in Lonnie Edwards, but don't be surprised if Mickey Okafor grabs the Big 12's first-team spot at right tackle by season's end. The Red Raiders return all five starters, and will have to play well to support new faces at every skill position on offense.
7. Kansas: Four of the Jayhawks' starters are juniors and another is a senior, and for all of KU's struggles last season, it did have some success running the ball in spots, even though its 1,615 total rush yards were the fewest in the Big 12. James Sims (742 yards, 9 TDs) returns and KU adds a possible home-run threat in Darrian Miller, but the offensive line returns 97 total starts, 15th-most in college football and second-most in the Big 12. That has to pay off eventually, if not this season.
8. Iowa State: The Cyclones boast the league's best left tackle, Kelechi Osemele, but center Ben Lamaak is gone and ISU might turn to redshirt freshman Tom Farniok as his replacement. Brayden Burris is solid at right tackle, but sophomore Ethan Tuftee, who has very little experience (just five appearances total), enters fall camp as the starter at right guard.
9. Texas: No, I don't know how this happens. But it's hard to deny. Run blocking has been a struggle for Texas, and new position coach Stacy Searels will have to change that for the Longhorns, who have kept quiet about any real depth-chart developments throughout the spring and into fall camp. Tray Allen's health is a concern, but Mason Walters played well in 2010 and David Snow has a lot of experience at center with 19 starts and 39 appearances. If this group can't ascend in these rankings during the season, Texas' turnaround from last season 5-7 campaign will not happen. Texas, though, has the fewest career starts in the Big 12, with 36, which ranks 105th nationally.
10. Kansas State: Kansas State has had the Big 12's leading rusher the past two seasons, but he's gone and so are three offensive linemen, including the unit's best blocker, guard Zach Kendall. Center Wade Weibert and guard Kenneth Mayfield also are gone, leaving gaps in the interior. Senior Zach Hanson joins Manese Foketi and Clyde Aufner on a unit that returns just 42 career starts, second-fewest in the Big 12 and 97th-most in college football.