This is what I have always conjured up in my own mind:
JD made it clear he wasn't in favor of the move to the ACC. It kinda of changed his recruiting "footprint" Then when it happened, and he continued to work his tail off recruiting and coaching, with less than his usual results, he had the feeling that "I knew this was gonna happen." Then he did everything he could to reverse the trend and came to the point that he said "I can't make it work, perhaps someone else can, so I will have to go and try it somewhere else, good luck to the next guy."
Perhaps you have inside information, where is my thinking wrong?