I don't know how true this really is. I'm sure coaching has to do with it somewhat, but putting all of the blame on the coaches and none on Athan seems unfair. If AK was truly a great quarterback, I feel like he would be able to use his raw talent to overcome some of the poor coaching.
A talented player is a talented player. Sometimes scheme A might fit them better than scheme B, or a different coach can give more appropriate advice. But I feel like if AK was who we all wish he was, he would be able to make at least a few more plays this season that would have made the difference between wins and losses.
There have been plenty of players in college football who've been talented enough to excel even with poor coaching, too. Denard Robinson was really good even though he was being led by two coaches that didn't last long at Michigan. Johnny Manziel was able to win games on the fly even though he was coached by Kevin Sumlin who flamed out.
I'm not comparing AK to these players, I'm just saying if the talent is there, they can make some magic happen. Outside of Wisconsin last year, AK hasn't done much, and I honestly think it's a good thing that Tanner Morgan had to step in during the bowl game last season because I'm not sure Athan would have won the game.