If he wins, he'll be fine. Look at the coaches between Bear Bryant and Saban.
Ray Perkins: won at a 67.7% clip. More of an NFL coach.
Bill Curry: the day he left GT for Alabama is one of the greatest days in our football program's history. I respect the hell out of him, but couldn't stand him when he was our coach and I was growing up. Won 72.2% of his games at Alabama and got a brick thrown through his window. Left for Kentucky.
Gene Stallings: won a title with some of Curry's recruits. Actually had a lower winning percentage than Curry, but has a statue by the stadium.
Dubose/Francione/Price/Shula: all won less than 70% of their games and most at or below 50%.
He seems like a damn good coach, has won everywhere he's been and just finished runner up in the CFP. He needs good recruiters and he'll be fine. Most of the coaches after Bryant weren't very good coaches and not really prepared for that job. He should do well there.