If the Bills loose to Miami, they won't be playing the Bengals in the AFC Championship.
If the Ravens beat the Bengals, the Bengals won't be playing the Bills in the AFC Championship.
If the Bengals beat the Ravens, and the Bills beat the Dolphins. KC plays the winner of this game (LA), and Buffalo plays the Bengals, next week. Again, not the AFC Championship.
You're wrong. Accept the fact that you don't know everything.