Just going with YPA ranked defenses:
Cards - 24th
Chargers - 13th
Colts - 14th
Bucs - 5th
Raiders - 25th
They dinked and dunked the heck out of The Bucs, they averaged a little over 5 yards per play. In fact the Chiefs are 12th in the NFL in YPA (Bills are 3rd, though of course the Steelers game hugely helps).
Reality is that without Davis, both the Bills and Chiefs were dink and dunk offenses who didn't really get much in terms of explosive plays out of the pass game. That's directly attributable to no Hill or healthy Davis.
Guess I still disagree with you. There's a huge part of the equation thats not available for Mahomes. In fact he's half a yard under his career YPA this season compared to his career, and in fact just has one game this year over 7.5 YPA, when he had 9.2 against the Cards (who aren't good this year) on opening day