Maybe someone with more knowledge can confirm or deny this but nothing I ever saw in his playcalling really struck me as being particularly "awesome".
I mean it was good, don't get me wrong but he was also playing with an insanely talented, largely gimmick team. He always had a speed advantage in the Pac-12.
His sort of stuff won't work in the NFL but is he some great playcaller that just happened to play with insanely talented speed guys?
Seems like a weird move for sure. Not sure why you leave Oregon which is a dream job at this point for a college coach with the combination of great facilities, top notch endorsements from Nike and a relatively easy conference.