Bills win out AND
1) KC beats PIT, BAL beats HOU, DEN beats CIN: Week 17: Need SD/KC tie. Other games irrelevant.
2) KC beats PIT, BAL beats HOU, CIN beats DEN: Week 17: Need SD/KC tie and CIN beat/tie PIT.
3) KC beats PIT, HOU beats BAL, DEN beats CIN: Week 17: Need BAL to lose/tie CLE or SD/KC tie.
4) KC beats PIT, HOU beats BAL, CIN beats DEN:
4A) Week 17 CLE beats BAL, CIN beats PIT, SD/KC irrelevant
4B) Week 17 CLE beats BAL, PIT beats CIN, SD/KC tie
4C) Week 17 BAL beats CLE, CIN beats PIT, SD/KC tie
4D) Week 17 BAL beats CLE, CIN/PIT tie, SD/KC tie
5) PIT beats KC, BAL beats HOU, CIN beats DEN: Bills eliminated.
6) PIT beats KC, BAL beats HOU, DEN beats CIN: Week 17 PIT beats CIN, KC beats or ties SD, BAL/CLE irrelevant.
7) PIT beats KC, HOU beats BAL, CIN beats DEN: Week 17 CLE beats/ties BAL, KC beats/ties SD, CIN/PIT irrelevant.
8) PIT beats KC, HOU beats BAL, DEN beats CIN:
8A) Week 17 CLE beats/ties BAL, KC beats/ties SD, CIN/PIT irrelevant.
8B) Week 17 BAL beats CLE, KC beats/ties SD, PIT beats CIN.
8C) Week 17 CLE beats/ties BAL, SD beats KC, PIT beats CIN.
8D) Week 17 CLE beats/ties BAL, SD ties KC, PIT ties CIN.
In some scenarios the "irrelevant" game does determine if the Bills are 5th or 6th seed.
There are no remaining scenarios I could find, even with ties, in which the Bills get in at 9-7. That's logical due to the number of 9 win teams already.
If the Bills finish 9-6-1 they can get in if Baltimore loses out and KC beats SD in Week 17. I am not going to enumerate all of those scenarios.