Well, if you guys want to bring the Buffalo OL Coach to us, why not bring his Assistant Coach with him back to San Fran?
Ray Brown, Bills Assistan Offensive Line Coach
Regarding other coaches: I think Al Everest, our special teams coach is doing a good job (we definitely have to find new return guys this offseason, though), otherwise I would think the best Coach from the Bills by far would be Bobby April, their special teams coordinator:
Bobby April bio
His special teams consistently rank at the very top of the entire NFL and he has a lot of sweet trick plays up his sleeve, like fake punts and stuff. Again, I think we have a great coach in Al Everest, but I have to admit, fake punts always intrigue me