If Alex is really leaving for the APR issue then he is just not very smart.
But I doubt that is why he's leaving. Face it, he's not very good and he has peaked. His marketability is better if he says he's leaving due to the APR issue than saying that he is in the doghouse and is not going to start next year.
Also, if it really is APR then why not wait until they make it official? Reality is that NCAA could very well change this in April (as they well should). And if they don't, we're going to sue them and win (or they'll settle and give us a waiver). Retroactive like this doesn't fly in America.
I really do feel for Alex, tough year. But this is just another sign of weakness. He just can't hack it at the highest level.
On the bright side... this could mean that Alex thinks AD is coming back...