What I found interesting was that Chip Kelly took 5 assistants with him to Philly from Oregon. At the time a number of people on here said he didn't do the same thing as Marrone. 1 less assistant is not much of a difference.
While here, Marrone established that he wasn't afraid to make staff changes if he didn't think something was working out, and the exhibited no Orange bias (example Conley). If he thinks a guy isn't working out in Buffalo he won't hesitate to replace him.