I mean, it would be shocking. But the Chiefs have to be one of the worst undefeated teams I've ever seen. They remind me of the 2020 Steelers. They started 11-0 and then lost 4 of their last 5 (including to the Bills) then got blown out in the playoffs.
Their first loss that season was to a Washington team that was 4-7-1 at that point.
Flawed teams eventually get exposed