The Bills playoff position wasn’t determined until the leagues final regular season game ended. The potential matchups / times were shown at halftime. Iirc , the Chiefs were playing on Saturday regardless (I believe NBC wanted Mahomes for their Peacock exclusive game ) and there was a scenario where the Bills were involved in that game. The Bills as the 2 seed were going to play Sunday after a Sunday nite game the previous week. That sounds about right. It was one more day rest vs the 3 seed with a Saturday game.