To be fair, the consensus before the season was that the Chiefs were unlikely to continue to win close games at the % they did last year, and would regress to the mean with a more 'expected' winning %.
I would say that the Chiefs being in 11 one-score games _already_ marked them as not nearly as dominant as they used to be _last year_ .
Again, nothing's been ruled out. Someone has to get the 7th seed, and the Texans 5 wins already include both of their gimmes vs the Titans, the Chargers' offensive line is atrocious, and the Steelers defense is terrible AND their offense is very inconsistent.
(Though again, the biggest wildcard to those final standings might well be if the Broncos rest their starters in Week 18 and give the Chargers a free win.)