You are missing the point. Culpepper is NOT a backup worthy QB.
The quality of Minnesota's QB corp is moot. It has nothing to do with the quality of Green Bay's. My point is that if you bring in Fumblepepper, it will definately be an example of "subtraction by addition".
Culpepper is a head case. He is convinced that he is the greatest to ever play the game, he acts (poorly) as his own agent, he causes strife in the locker room, he doesn't listen to his coaches, he expects to be treated like a king...
If he backed up Aaron Rodgers, he would constantly try and undermine him for the starting position. It would be a bad situation.
No smack talking there, just some simple observations from someone who put up with culpepper's antics for a long, long time... But hey, if you want him on your team, more power to you. Believe me, If Culpepper ever wears green adn gold the last thing I would be is jealous!