Both these teams are pretty equal in my mind. Maybe the Jet's are a tiny bit better, but Rex is much better coming off a loss than a win (I always fade Rex after a win, the numbers is incredible.
To me this like should be Buffalo -2.5, not a PK.
The Jet's played a tougher game, but both have plenty of flaws and the Bills can take the home opener. I lean Buffalo for sure. I don't get the line movement at all. Sammy Watkins is hurt? He isn't worth 2.5 points. The only thing keeping me from jumping on this is I am, like the original poster, not sure why the line has moved so much.