I heard alot of the same too, but by all accounts he is very humble. He spent the entire offseason in the film rooms, the weight room, and on the field sharpening his skills... so it seems to me as if he is not meeting the mold we both heard rumors about.
I for one hope he is somewhat cocky, because swagger boosts confidence in the huddle. Unfortunately, too much swag leads to seperation of players...
Immaturity on the field though, I am concerned about. He is essencially a rookie, and a rookie who can run with the ball. Hopefully he doesn't get to easily flustered in the pocket. We don't need a Micheal Vick, we want more of a Randall Cunningham.