Nope. Pretty simple. JM came in and installed a system that'll be capable of beating elite defenses (you have to be able to throw down field, something Mullen's offense never did and doesn't do), but then he realized who his QB was.
He's got an absolute stud and perfect fit for the offense signing in December and enrolling in January by the name of Garrett Shrader. He's about 6-4 with a big frame and very athletic.
Some folks act like asking a coach to adjust his offensive philosophy wouldn't present any challenges. If asking players to change philosophy causes issues, why wouldn't asking a coach to do the same thing not cause them as well?
I personally underestimated the changing of schemes. I thought Fitz would be better, but not 1st round NFL draft pick like some preseason drafts had Fitz. I do gripe about not feeding the RBs more, but other than that I see tight ends dropping a lot of passes and a QB who's inconsistent and can't really read defenses very well. Not to mention our QB went from top end speed around 4.5 to a 4.7.
JM hired a very good coaching staff. They all recruit better than any coach we've had previously and that's saying something. As much as Mullen hated recruiting he did elevate us.
I don't have an answer for why we don't feed the RBs. I am dumbfounded there and it pisses me off, but guess what Mullen pissed me off a lot too. Saban is the only coach who doesn't piss off his fanbase.
Lastly, folks like Drebin saying "our football team is retarded." How retarded did they look when Mullen took in the best team he's ever personally coached at Miss St ranked #1 at Alabama and we were down 19-0 and the game was over nearly immediately??? at the onset?