Buffalo came into Arrowhead to start last season and left the Chiefs broken both physically and mentally. The illusion of being the defending AFC West champs shattered long before time expired on a 41-7 blowout that ended Eric Berry's season with a torn ACL.
It practically ended the entire team's season before it started, too. Kansas City would then go to Detroit and lose 48-3 with Jamaal Charles joining Berry and Tony Moeaki on injured reserve.
Now, this payback isn't about some personal vendetta. Head coach Chan Gailey did well for the Chiefs in 2008. Gailey also spoke to the media this week to let people know the Bills had no intent on injuring Berry.
No, this is solely about the Chiefs and banishing the specter of last year's dysfunctional season. Especially after last week's collapse against the Atlanta Falcons, Kansas City needs a solid win to get this season headed in the right direction; to do that, they need to execute on these five things both on Sunday and for the rest of the season.
If they don't, the Chiefs could find themselves mired in the same funk that almost ended their last season before it began.