The Bears have the NFL's best defense, according to Football Outsiders. It's a fine unit, though not one that will make Bears fans forget 1985 or even 2006, and it may be a little overrated coming off a Jets-Bills-Lions daisy-trampling.
Speaking of the Bills, they're No. 2, and they have to be just to survive every week, because their offense is a different kind of number two.
The Texans rank third by virtue of the health of J.J. Watt and Jadeveon Clowney, followed by the Broncos and Ravens, neither of whom are drawing any comparisons to their 2015 or 2000 models.