Spring ball is to get reps for new guys and figure out how to fill spots and see where your depth is at. Not to help your starting QB get significantly better.

He can do far more through the summer and fall to improve much more than he would have lost by participating in throwing in the spring. His mental work and the connection he develops with guys over the months is more important. Also everything he can do as a leader like getting guys going in player run practices and extra work. He can start throwing with them as soon as he's ready.