There are no flawless teams in the NFL this year. I suppose you could say there are never any truly flawless teams, but 2016 is atypical. There was not a single team heading into Week 13 ranked in the top 10 in both offensive and defensive DVOA. There were four last year. Even the obvious favorites -- your Cowboys and Patriots of the world -- have holes on their rosters, caused either by injuries or other personnel choices.
Yet we know teams can overcome these sorts of problems. The Broncos were 25th in offensive DVOA and first in defensive DVOA last year and won the Super Bowl.