The game note stated that since 2009, Kelly was among 8 head coaches that guided teams to undefeated regular seasons. Only four (Meyer, G. Patterson, Kelly and now J.Fisher) have done it more than once. You mentioned Saban. The others did it at Boise State, Houston and Northern Illinois.
Yes the fraternity is limited. It is looking at recent success in college football, which is certainly one place you would look for a new coach.