I disagree that Nesbitt has to 'bomb' to move positions. Unless he excells, he will eventually play the position that gives him the best chance to play pro ball.
IMHO, if the guy beats out Threet, he has Pro potential at QB and he should stay there. But there are many who think he has the physical skills to be a pro at other positions. There are very few players who would rather be a backup QB and then a working Joe vs a starting safety (for instance) and then a Pro football player.
Ball was a starting QB and his pro prospects would be better if he had been moved. It is even possible that Nesbitt, if his physical skills are close to what they say they are, should consider a switch sooner rather than later...