I get that Kelly was very successful as a college head coach but I still don't see why so many people are sure he will be successful wherever he goes. He has only been a head coach for four years so he never played with only his players (you may could argue this since he was OC before HC) and he got the school put on probation and received a show cause during his short tenure. He was a massive failure in the NFL but Saban was too so I guess that is not that telling.
I don't think Kelly would be very successful in the SEC but he probably would be more likely to be successful in the PAC 12.