You've already read half of this story. Surely you're aware of the increasing size disparity between NFL pass-catchers and cornerbacks. That train has left the station, and there's no going back.
So here's what I'm interested in: Assuming they don't plan to forfeit the season, how will NFC North cornerbacks and coaches deal with what looks like an increasingly one-sided matchup?
I spent part of CampTour'12 asking cornerbacks, receivers and coaches a version of that question. After all, the Chicago Bears' acquisition of receiver Brandon Marshall means that each of our teams has at least one receiver taller than 6-foot-2 and one or more tight ends who stand at least 6-4. In total, the division boasts six "big" receivers and seven "big" tight ends based on those qualifications, as the first chart shows.
On the other hand, there are only three NFC North cornerbacks taller than 6-feet among the 12 expected to make up each team's primary rotation. (See second chart.) Cornerbacks don't always match up in single coverage against big receivers, and bigger safeties often take on tight ends. But at some point there is no choice. Eventually, NFC North teams will have a 5-foot-9 cornerback assigned to a 6-foot-4 receiver, a height differential of more than half a foot.
Most everyone engaged thoughtfully on the issue, and below I've categorized their thoughts in three ways. Let's take a closer look.
Muscle up or play off?
The game is football, of course, so the instinct of many cornerbacks is to get physical with big receivers -- especially at the line of scrimmage and even as the ball approaches. That approach is almost always a mistake, NFC North cornerbacks agreed.
"A guy that big, you don't want to be too aggressive with him," said Green Bay Packers cornerback Tramon Williams. "You want to feel him, but you don't want him to feel you. As a big receiver, he wants you to be aggressive. That's his thing. He can push you off and do things like that. He can get separation and get you off your stride. So you don't want to be too aggressive with guys like that."
Instead, cornerbacks often are best served to "stalk" bigger receivers as they run downfield.
"They love for a little guy to get physical so they can body you," said Detroit Lions cornerback Chris Houston, who spends most practices matched up on 6-foot-5 receiver Calvin Johnson. "You've got to be smart, use your technique throughout the game. You can body them sometimes, but the majority of the time, they like for you to try to get in there. Their arms are much longer, so they can get you before you get them. You've got to be smart on your technique and stay disciplined."
The NFC North's shortest cornerback is Antoine Winfield of the Minnesota Vikings, whose reputation as a physical tackler overshadows the fact that he rarely tussles with receivers until after the ball arrives.
"I like to play off," Winfield said. "It's hard for me to be fighting with a guy who is 6-4, 6-5 at the line. He has the advantage. The first thing he is probably going to do is run at me, grab me, throw me to the side and take off."
Thinking back over his career during training camp, Marshall said "every guy plays a little differently." But Marshall could identify only one cornerback who deliberately got physical with him at the line of scrimmage: the Denver Broncos' Champ Bailey, who is just under 6-feet.
"A guy like that, he loves to go against big guys," Marshall said. "He trusts himself."
Everybody jump, jump
What Bailey and many other cornerbacks lack in height, however, they try to make up with timing and leaping ability. Bears coach Lovie Smith, in fact, said that vertical jumps are one of the most important attributes he seeks in defensive backs.
"Once the receiver gets off the ball," Smith said, "and he gets in position and the ball is thrown up in the air, just throwing it up high and it's a jump situation, that height and that vertical is going to come into play. And for us,most of our DBs have good verticals. They're 36-[inches] plus, 37-plus for a reason.
"If you have a good vertical, eventually if the ball is in the air, you can go out there and get it. I just don't think it's a gimmee just because you have a tall receiver and the cornerbacks are shorter. Most of the guys in the league are playing under six feet at the corner position and they're making a lot of big plays."
Indeed, the Bears employ two cornerbacks under 5-10 -- Tim Jennings and D.J. Moore -- among their top three. Jennings recorded a 37 1/2-inch vertical jump at his scouting combine, while Moore hit 39 1/2. Charles Tillman, who at 6-1 1/8 is the second-tallest cornerback in the division, had a 40-inch vertical leap.
"You never concede a jump ball," said the Packers' Williams, whose vertical has been recorded at 41 inches. "I've always been confident in my jumping ability. Me personally, I haven't had many jump balls caught on me."
Of course, big receivers watch film and usually know who the good jumpers are. Packers receiver Jordy Nelson said there are ways to maintain the height advantage against a cornerback who can jump.
"When we watch them, we see how they can play a deep ball," Nelson said. "If we know that so and so is out there, we know that you really have to attack the ball in the air. He is going to go up and get it. You've got to go compete for it. You can't let it come down and try to catch it over your shoulder. There's things like that that we watch."
In the absence of jumping ability, Vikings coach Leslie Frazier said, shorter cornerbacks must rely on extraordinary quickness and speed. The Vikings, for example, this year drafted the player who ran the fastest 40-yard dash at the 2012 scouting combine, Central Florida cornerback Josh Robinson (4.33 seconds). Robinson is 5-foot-9 1/2.
"What we try to find is a guy who is extremely quick," Frazier said. "Sometimes you can out-quick guys who are long striders, and they're usually better a little bit down the field. If you can offset some of that with the quickness, and you are a gnat, just harassing them, that helps."
Coaches can play an important role in equalizing the physical mismatch as well. Although it is bound to happen at some point, the least appealing way of defending a big receiver is putting him in a pure man-to-man matchup with a cornerback.
"There are things you can do where you don't get isolated in coverage," said Lions coach Jim Schwartz, whose top four cornerbacks are all under 5-10. "You're playing man but you get a double team from somewhere, and so you're not playing the 'whole' man. You're not playing that whole 6-foot-3 receiver. You're only playing a portion of him. Those ways can be significant."
If you're not in position to double-team, the Bears' Smith said, zone concepts usually work better in physical mismatches. Players in man coverage usually turn their backs to chase the receiver they're assigned to, while players in zone are taught to keep receivers in front of them so they can watch the quarterback.
"It helps to play a little bit more zone," Smith said, "where you have your defensive backs with their eyes on the ball. When you're short and you're playing man-to-man and you have your back to the quarterback, there's a lot of things going against you in that situation."
So where does this leave us? When I spoke with Marshall about this topic, he smiled and said he didn't want to give up any secrets for exposing height mismatches. In truth, however, there aren't many.
Cornerbacks must play smart, both in technique and within the scheme. They need a physical attribute, especially jumping ability, that helps compensate for their height disadvantage. And they need to realize that, no matter what approach they take, NFC North teams are going to utilize their big receivers to complete plenty of passes. The defense that can best minimize the impact of those completions will put its team in position for the NFC North title.