You can make the argument that the Kansas City Chiefs are the second best team in the AFC playoff field right now. They have given strong indications over two games that they're better than the Broncos and the Bengals are currently playing with something called an AJ McCarron. The Chiefs could be the second best team in the AFC with the way things stand at this moment.
The best AFC team would be the New England Patriots. I don't think many Chiefs fans are going to argue that KC is a better team than New England.