Judging NFL Week 13 overreactions: Another MVP for Tom Brady? Could Mike Zimmer be fired soon?

The calendar has turned to December, which means it is the time of year when overreactions turn into ... well, just reactions. We have almost 13 full regular-season weeks of evidence to help us figure out who's good, who's not and who has a chance to raise the Lombardi trophy in early February.

Yes, the playoff races in both conferences remain wide-open. But some teams have begun to separate themselves from the bunch, and it's worth taking a look at what they're doing with the playoffs now five weeks away. All four NFC division leaders are looking good. Monday night's Patriots-Bills game could go a long way toward deciding the AFC East. The past two Super Bowl champs are playing very well, and if you wanted to pick them to return to the Super Bowl for a rematch, it'd be tough to argue too hard against you.

Yet, there's still plenty to figure out. Which means there are still plenty of Week 13 overreactions to sort through. We'll start this week with the team that's played in the past two Super Bowls.

The Chiefs, after all that, will end up with the No. 1 seed in the AFC