I'd actually say that at this point in time, almost every AFC top-end team has/is struggling.
Steelers look awful.
Ravens look like they are struggling to adjust to new faces.
Patriots offense is struggling bad.
Texans are struggling compared to last year.
Besides the Broncos, the Chiefs, Colts and Bengals look like the best teams at this point in time (though the Chiefs have only played one average team).
The NFC looks so much better as a whole with the 49ers, Seahawks, Falcons, Packers and Saints looking like their old selves.