1) Seattle and New England look like the most impressive teams coming in statistically. If I had to bet on it, Seattle repeating wouldn't surprise me. But they're about as good of odds statistically as a typical dominating NCAA title favorite in basketball. So it's not that sure of a thing.
2) Denver has slacked off and Green Bay has a typically mediocre defense to go with their ridiculous offense. Dallas has an even worse defense than Green Bay. Pittsburgh's D is worse than both. I'm not sure I'd go with any of these teams. Don't sleep on Baltimore would be my gut reaction to looking at the rest of the top tier of the field.
3) Arizona and Carolina are the two worst teams in the field. Both are in the bottom third of the league. Arizona at least has a decent D. Actually other than Seattle and Green Bay, nobody looks that great in the NFC. Detroit has a good defense, but not much offense.
4) AFC wise, Cincinnati has the same mediocre offense but also has a mediocre defense to go with it. Indy is in the same boat. This is unlikely to be a good playoff combination.
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