using 2015-16 stats
PTS/YDS/TOs/PEN
KCoff/794/10787/32/1726
BUFoff/778/11441/31/2209
KCdef/598/11165/62
BUFdef/737/11414/43
Of course RED ZONE PERF by the defense, and lack of turnovers forced, and penalties, and special teams
All trademarks of a well-coached squad maximizing their ability, with perhaps a but of luck, and not beating themselves
A team that is 23-9 vs a team that is 15-17 is more than just talent. The Chiefs may have a bit more talent than Bills, but not as much as people think. But, they are well coached, fundamentally sound, and let the other team beat themselves. And, they are also able to hang into close games against teams with equal or better talent.
To deny Club Rex is problem number 1 is to deny reality.