Peppers stands out because he is surrounded by others that do not. He doesn't have any competition over there.
It reminds me when Zach Boren switched from FB to MLB because our Linebackers were playing very poor and we didn't have good depth.
In Peppers case, when he has to play RB, CB, Safety, LB, that tells me that their talent is bad and their depth is lacking. It's a safe bet that Meyer should never have to play a player on both offense and defense.