If statistics determined outcomes, the Bills would have beat the Viking and prob the Dolphins too. Situation success determines outcomes, not abstract measurement. The Bills appear to have a dominating D if you look at the stats, but nobody who watches the games, at least over the last 6 weeks, think the Bills D is dominating anyone.
The Dolphins have more than 1 guy who can catch the ball, and QB/OC willing to throw it to those other guys. That's what makes their O more dangerous than ours.