What he did at Oregon was special but College football has caught up to what he did there. His offense isn't at rare as it was in 2009. I believe he was also in early on how big S/C and nutrition was. He doesn't get along with Admin/Management very well and he doesn't like to recruit.
UCF leads the nation in scoring running that offense. Granted the AAC isn't a power 5 conference but the Oregon spread is hardly the wishbone. Kelly struggled against the powerhouse SEC schools for one reason. They were out talented on the lines. Oregon just didn't have the horses in the trenches.
AAC is the best non-P5 conference, but it's still the AAC. I would have liked to see their offense against GT, but that game was cancelled. They scored against Maryland, but MD is trash, and they did put up their most points against FCS Austin Peay (73) FIU (61), 2-8 ECU (63) and 3-7 Cincy (51). Their offense is still good, but some perspective.