There are no perfect NFL teams this season. Heading into Week 14, no team ranked in the top eight in both offensive and defensive DVOA. Each has a weakness, owing to an undeveloped part of its roster, the aftereffects of an injury stack, a schematic choice, or some combination of the three.
The right -- or wrong -- matchups produce unexpected results. The Rams have looked like an offensive juggernaut for most of the season, but matched up against a stifling Bears defense in the chill of Chicago, they collapsed on Sunday night. The Patriots have an inexplicable issue with winning in Miami.