"Sundays are different for Jim Kelly. Each game the Hall of Fame quarterback watches, he puts himself in the pocket.

"I'm looking at coverages. Is it Cover 2? Is it man coverage? What are the corners doing?" the former Buffalo Bills great said earlier this season. "I always put myself in the position of the quarterback."

And when Kelly peers through Aaron Rodgers' lens, he likes what he sees. He admires the Green Bay Packers quarterback's "flawless mechanics," his leadership ability, everything.

And yet, Kelly also knows how quickly everything can be snatched away. In his 11 NFL seasons, he suffered six concussions. That sixth hit ended his career. The final image of Kelly at Rich Stadium is a carbon copy of so many other retired NFL quarterbacks.

Dazed and weary, Kelly was carted to the locker room after suffering a concussion in a 1996 wild-card loss to the Jacksonville Jaguars. The End.

Last December in Detroit, Rodgers suffered his second concussion of the season. No defense has stopped him since. He hasn't stopped himself since, either. In reality, more concussions may be the only thing that could stop him. Today, Rodgers returns to Ford Field."