One thing on the Baltimore game to wrap it up and one thing going forward for the KC game (and they may be a bit related)
We held Baltimore to 25 points and scored 27. Baltimore this season, counting playoffs, was 13-0 when they scored 28 points or more, and 0-6 when they scored 27 or less. The most points they gave up in any of those 6 losses were the 29 (to Cleveland). Buffalo's 27 was tied for the 2nd most. So, again, kudos to the defense holding them under that magic number.
Looking forward (well, actually also looking back at the last KC meeting) - the KC defense actually held Buffalo's offense pretty well in check in the week 11 game. The backs in the running game, in particular, went nowhere fast (and the Bills abandoned it pretty quickly)
If anything, the defense played over expectations more in that game than the offense did. Both teams got 9 possessions, and Buffalo's defense got 6 stops, KC's 4.5 (counting a red zone stop as a half). I would not necessarily expect either team to score on less than half their possessions in this game, which means red zone stops to hold the scoring down will be key, as will doing a better job establishing the run on offense to avoid obvious passing downs where Spags can go to work.
KC's offense is playing better right now than they were earlier in the season when they played us. They can stretch the field a little better with Brown, and Kelce is going to be more of a factor in the playoffs. The big thing that concerns me is that KC really hasn't faced any "have to have it" moments on offense this year. They had a big enough lead on us for the conference when we met first that they could afford to lose that game, and the vast majority of the "scares" they've gotten this year they have been playing from ahead for most of the game. Since they lost to us, their opposition hasn't had a single possession while leading. They've got to have a handful of plays just sitting, waiting, that no one has seen before that they are waiting for an important offensive down to break out. That's not necessarily ideal.
That said, I do think we can play better on offense than we did in that week 11 game, and the Bills are certainly capable of winning this game.