I say two. They will have to play each other twice, so someone will be losing.
My predictions:
The mad genius Andy Reid redoes everything in KC, and they end up on top again.
The Chargers finally figure out how to win, or at least win enough.
The Raiders--probably has the most talent, but also has a Babe Ruth like curse on them. They will find new ways to self-destruct.
The Broncos, a great Defense, but I think Russel Wilson's best days are long gone. He will be a bust in Denver.