Crompton has the arm strength, that was obvious. I can't say I know this for football, but it seems like it would relate: In baseball, if a coach moves a middle infielder to third, it's not whether he immediately has the accuracy, it's whether he has the arm strength for the throw. I didn't have that arm strength and I remained a 2B, sometimes SS. I know several guys that did make the transition while I played and the coaches could teach accuracy, as long as they had the strength.
I would think that with Crompton's arm strength, a good coaching staff can get the accuracy part down over time. Can this coaching staff do it? Well that remains to be seen.