I'm really not seeing it with the Chiefs this year. I understand the "2014 and 2018 Patriots" where they looked rough early those years but then come back and still went on a run to make the AFCCG/Super Bowl with Brady and Belichick. The Chiefs though just look older and slower than usual. Kelce is probably washed. Not enough weapons, and their O-Line is also shaky.
I thought KC also got a bit lucky today with PHI being conservative on playcalls for some reason. This same defense was getting diced up by the Chargers last week and when PHI needed to make plays they did. Chris Jones is a beast but the secondary is shaky too. Lot to overcome and I think there's more great teams this year (Packers, Eagles, Bills, Ravens, etc.). KC's schedule is also not easy.
Mahomes also missed guys on his own which is rare. Before the ultimate Thornton bomb, he overthrew him when wide open by a good 10 yards and he was not pressured.