I agree that repetition and practice can certainly increase accuracy, but I just can't imagine that the coaches are depriving him of reps as our starting QB.
Look at how good our running game is vs the passing game. What do you think they spend more time doing in practice?
I'm just not buying that. The QBs are not practicing handing the ball off all day. I'll grant you that they may be practicing the run game a lot, but I'd need a lot of evidence to believe that the QBs are lacking reps in throwing.