You forgot about the NFC East and the NFC South, both of which featured three teams at midseason who could have all feasibly won the division, and have beaten quality teams in both conferences and had chances to win their very tough divisions midseason. The Cowboys and Falcons have since tanked, and the Redskins and Bucs are teetering on the playoff edge, waiting to barely sneak into the playoffs and get slaughtered by a superior team. I don't see how you could make an argument for anyone in the AFC South besides the Colts and maybe the Jags (What the fuck? The Titans and Texans?!), or in the North with anyone outside of Pittsburgh.
Jacksonville is horribly overrated (they played MUCH better defense last year, and their offense isn't any better with Leftwich and Taylor out), and the only team the Bengals have beat over .500 this season is the Steelers on a down year and with BenRo fresh off the injured list. How does this make them an amazingly great team? They can lay down all the 45-17 beatdowns on shitty teams all they want, unfortunately this isn't college football where that'll improve their ranking. You won't get any argument from me on Indianapolis, obviously, despite their loss yesterday.
Cincinnati also beat the Bears.