Alright here is a chart. If Cincy is the #2 and makes the AFCCG and so does KC they play at a neutral sight. If Cincy is the #3 they play in KC This is so damn convoluted the NFL is just stupid.
Edit: Shit I didn't see this was in the OP but you can clearly see an option for KC and Cincy playing on a neutral sight. Buffalo loses and Cincy wins and it flips.
Nevermind I'm an idiot, that all goes away if KC wins. Sunday.
Let's hope for a Buffalo loss.