I think it's pretty clear that AE left because he felt the deck was stacked against him.
What I find interesting is that of the two QB's we have, neither of them are very productive in an offense where they should be.
Dylan has played marginal, and I really thought he'd get better as he seemed to grasp Snyder's offense very well. Even playing in backup to Roberson, he seemed to do things well. Of course, he had a much better O-Line..