But they may have too, if both KC and Buffalo win this next weekend, no way is Buffalo going to allow the league to crown KC the number 1 seed when they beat KC at KC earlier in the year. There is also no way KC is going to want to give up hosting a game when they can say they won more games than Buffalo.
You also have to throw in the fact that both teams want to avoid playing Cincinnati until the final game, and the way it plays out, without that game from last night being made up, one of the two teams will have to play the Bengals before they play the other team. Cincinnati would also want to make up the game, because if they beat the Raven's Sunday, and the Chiefs win, they would have to go to KC in the playoffs, it's possible if the Chief's lose, the Bengals could host that game.