Dolphins did work last year.. They are "known" also.. Same coach, offense, QB, WRs, RBs..
I think buffalo had some key losses and didnt seem like they improved anywhere.. There was no key free agency adds and only losses.. If you are lead dog, you have to find ways to get better or your opps will catch up.. They lost Tremaine Edmunds, Isaiah McKenzie, Devin Singletary.. I didnt see any of those key pieces UPGRADED.. So I want to say they got worse, but will hold off after a couple weeks because jets D is like that..