The Bills made moves over the off-season to improve weaknesses on offense, which is where they struggled last year. They're working on extending Peters, and adding another RB. They have a hole at LG and need a proven TE, but they could literally play anyone at LG and have him produce as well as Dockery did the past 2 years, while Fine could be a player and there is the draft.
On defense, they lost more or less lost nothing since Crowell didn't play last year and Greer missed 6 games and was going to be replaced by McKelvin anyway. What they added was an excellent nickel (not starting) CB in Florence, will get Schobel and Youboty (who looked like the best DB until he got injured, and that will always be a concern with him) back, and they figure to draft heavily here.
And the schedule doesn't look as hard as the "it's the 6th hardest on paper!" makes it out to be. I can see 10-6.
So buck up little camper!