Sure, Rex is a defensive guru. And he has the players on that side of the ball to terrorize the opposition. After all, Buffalo led the NFL in sacks last season, and the entire D-line returns in 2015. On offense, the Bills boast a series of playmakers. LeSean McCoy is great. As is Percy Harvin -- when he can stay on the field. And Sammy Watkins could truly emerge, provided he has the right signal-caller to get him the ball. Of course, therein lies the problem.