OLB work for Irvin, Avril?

Though a player's versatility can be cited as a negative by some -- so-called "tweeners" sometimes don't fit in to any position at the NFL level -- the capacity for a defender to move back and forth between the defensive line and into space as a linebacker can be of great help to a defense. To wit, Von Miller of the Broncos and Mathias Kiwanuka of the Giants have led quite productive careers to this point. And for 2013, we may see a pair of Seattle Seahawks defenders pull off a similar feat.