I don't think much of him as a head coach.
He has a good reputation among coaches, but so did Jeff Fisher. I don't see it.
He likes to be aggressive even when the situation doesn't merit it. I believe as a result, there are no consequences for making mistakes on his teams. "I was just being aggressive coach."
His teams love him and that love is shown by 11 individuals on the field. Not a team.
So he can come in, inject some enthusiasm and be pretty good for awhile. But that doesn't last. Two years tops Maybe three if he has "bad-cop" coordinators But it eventually turns downhill into a talented team giving away games and Ahrens looking for a new job.
College offensive coordinator should be his coaching ceiling.