The Chiefs have causes for concern.

The reigning champs were just held to nine points — marking just the third time with Patrick Mahomes they failed to score a touchdown — against a Broncos defense that surrendered 70 points to the Dolphins. Mahomes’ least-explosive supporting cast has dropped a once-fearsome offense to 12^th in the NFL in points per game (23.4).

The 49ers have lost three straight games since being crowned the league favorite.

All but two Eagles games have been decided by single digits.