I think it often comes down to a coach's style and what he looks for in a QB more than anything. Some, like Saban, seem to look more at decision making skill while others look more for athleticism (not saying AJ isn't athletic). Preferably you would want one with both, but I would imagine, if it came down to it, they have certain things they look for.

I would bet (and hope), that race plays no part in the decision.

If you do the things you need to do when you need to do them then someday you can do the things you want to do when you want to do them.