‘Nathaniel Hackett followed Marrone from Syracuse to Buffalo this offseason, and the NFL’s second-youngest offensive coordinator will bring a speed-based offense to the Bills. Hackett wants to ramp up the tempo, getting plays off with 20-25 seconds left on the play clock. He has weapons on offense to play with. In addition to holdovers C.J. Spiller and Steve Johnson, the Bills selected a pair of receivers high in April’s draft. The reality, though, is that Hackett may need to temper expectations on offense as he develops Manuel at quarterback. There’s big-play potential from this offense, but a heavy dose of Spiller may be the best bet initially.’