I really doubt Baltimore goes 5-1. They have 4 division games left and the Packers and Patriots. They have been winning recently, but they look really bad while doing it. I think 3-3 is more likely than 5-1 for them.
I also doubt KC goes 5-1. They still have 3 tough games (Texans, Chargers, Broncos) and Dallas can also beat a good team. 4-2 is their ceiling IMO.