The Buffalo Bills still have a very narrow window to the top seed in the AFC. Think microscopic.
If the Bills win out to get to 13-3 and the Kansas City Chiefs lose out to get to 13-3, the Chiefs own the head-to-head tiebreaker over Buffalo. So the Bills need another team in the mix.
If the Buffalo Bills, Kansas City Chiefs, and Pittsburgh Steelers all finish at 13-3, the Bills have a chance. No one has a head-to-head sweep. AFC record would be the next tiebreaker, and all three teams would be 10-2 in our hypothetical scenario.