the thought is that the chiefs are the better team no matter the opponent. therefore it is advantageous for the chiefs to have as many possessions as possible, because more possessions means more time for what's supposed to happen to actually happen (the chiefs scoring more than their opponent). so when the chiefs run the ball 40 times it shortens the game / limits possessions quite a bit. it's why you can rush for 400 yards in a game and look up in the 4th quarter and it's still a one score game. fewer possessions favors randomness, which favors the worse team. do you guys ever watch bruceketball?
the bills strategy actually worked because they baited the chiefs into running way more than they normally would, and sure enough it was 23-17 in the 4th quarter, with the bills only needing one stop to get the ball back, which they almost did! about as good a chance as any team could hope for vs the chiefs.