The thing is, some teams take those problems you listed and are able to solve them, others cannot. We have no idea how this will play out.
A lot of the problems you mentioned for the Bills, or similar ones, could easily apply to many of the teams you mentioned. How about these:
TB, ATL: QB issues,
ATL: inexperienced receiver corps
CAR: RB injury problems
OAK: new starter at RB
KC: major questions on defense
I could go on, but I don't need to. Most teams in the middle of the pack, which is where the Bills have to be considered after last year, can't really be judged to be any better or worse at this point.