For your viewing pleasure: the current state of every possible Bills tiebreaker:
At 9-7
2 way tiebreakers:
vs BAL: If Baltimore loss is to IND or CIN and Bills loss is to NE, the Bills currently win the tiebreaker on strength of victory. If BAL loss is to CLE or Bills loss is to MIA, BAL wins.
vs JAX: Loss (conference record)
vs TEN: Wins tiebreaker via common opponents *unless TEN loses to SF and LAR but beats JAX and still doesn't win the division.*
vs AFC West teams: Decided by games result (wins vs OAK, KC; loses vs LAC)
3 way tiebreakers:
vs BAL/JAX: Jacksonville wins tiebreaker via conference record, next spot decided by BAL/BUF head to head tiebreaker above. (Second place would make the playoffs as the 6 seed here in all cases)
vs BAL/TEN: Unless * happens (see H2H tiebreaker), tiebreaker is determined by winner of BUF/BAL H2H tiebreaker. BUF would be 2nd if BAL wins that tiebreaker. If * happens, TEN wins the tiebreaker and the winner of the BUF/BAL 2-way tiebreaker is #2. (second place makes the playoffs as the 6 seed here in all cases)
vs BAL/KC: Kansas City wins on strength of victory, #2 is decided by 2-way tiebreaker vs. BAL (not good enough unless TEN collapses)
vs BAL/LAC: Buffalo currently wins by strength of victory.
vs BAL/OAK: Decided by BUF/BAL 2-way tiebreaker - if they lose it, BUF is #2. (not good enough unless TEN collapses)
vs JAX/AFC West team: Jacksonville wins via conference record, then whoever won the head to head matchup between BUF and the AFC West team is #2. (but it probably won't matter unless Baltimore collapses)
vs TEN/AFC West team: Goes to strength of victory (Bills win vs. everyone but KC currently) - in case where KC wins, BUF is #2. However, again, if * happens, TEN wins the tiebreaker via conference record, and winner of BUF/AFC West team tiebreaker gets #2. (Again, #2 likely is not good enough unless Baltimore completely collapses).
4 way tiebreakers (two spots available in all possible 4 way tie scenarios):
vs BAL/JAX/KC: Jacksonville wins, KC #2.
vs BAL/JAX/LAC: Jacksonville wins, BUF #2 (strength of victory)
vs BAL/JAX/OAK: Jacksonville wins, winner of BUF/BAL 2-way tiebreaker #2.
vs BAL/TEN/KC: KC wins, winner of BUF/BAL/TEN tiebreaker gets #2
vs BAL/TEN/LAC: Exactly like the BUF/BAL/TEN tiebreaker.
vs BAL/TEN/OAK: Exactly like BUF/BAL/TEN tiebreaker.
*It is possible to get two AFC West teams in the wild card chase at 9-7, but Oakland would be the team involved in the tiebreakers in that case (with KC winning the division), and Oakland finishes behind Buffalo in all tiebreakers, so the 2nd AFC West team at 9-7 (LA) does not matter.
At 10-6:
2 way tiebreakers:
vs. BAL: Loss (common opponents)
vs. TEN: Win (common opponents)
vs. JAX: Loss (common opponents if losses come to HOU and TEN, conference record if a loss comes from SF)
3 way tiebreakers:
vs. BAL/TEN: BAL #1, BUF #2 (will be #6 seed)
vs. BAL/JAX: If JAX loses to HOU and TEN (beating SF) to get to 10-6, BUF currently wins a strength of victory tiebreaker. If JAX loses to SF and finishes 10-6, they will win via conference record, then BAL will be #2 via common opponents.
Also, the Bills technically currently hold the #6 spot via strength of victory over Baltimore, despite the fact that if both teams win out Baltimore would win the H2H tiebreaker.