If rankings of defense and offense correlate directly to winning, does that mean the super bowl winning team, or even the team with the best regular season record, would invariably have the highest offensive and defensive rankings?
The teams near the top almost always have winning records, the teams in the middle are usually around .500, and teams near the bottom usually have the worst records. The correlation between passing successfully and winning is strong, the correlation between stopping the pass and winning is strong, and the correlation between
doing both and winning is even stronger.
Passer Rating Differential
Cowboys' NFL rank
2011 9th
2012 18th
2013 18th
2014 2nd
2015 29th
That's the team's offensive number minus the defensive number. Last year, there were 28 teams ranked higher than Dallas in PRD, and 28 teams with better W-L records. The year before, Dallas was tied with four other teams for the best record, and those five teams were the Top 5 in PRD. The two years before that, we ranked near the middle of the league in PRD and finished 8-8 each time. The 2011 numbers say we were good enough to go 10-6, so out of the 80 games in those five seasons, PRD was off by about two games.
Does a high passer rating mean your team should win or just that you pass a lot and have a good QB?
SInce it's a measure of efficiency (not production), there's no correlation between passing a lot and a high passer rating. In fact, last year's Top 5 teams in passer rating ranked 5th, 19th, 20th, 26th, and 28th in pass attempts. Does a higher passer rating mean you have a good QB? Here's the list of the guys who have had the most Top-10 seasons in passer rating: Manning, Montana, Brady, Marino, Tarkenton. You tell me.
Does a poor defensive ranking mean your defense just stinks or that they've had little help from your offense and special teams? The numbers are clear, but I think there are many ways one could explain them.
So explore the possible explanations. You say we didn't produce a winning season until we committed to running the ball. What allowed us to do that? It wasn't just an improved OL, it was also the fact that we had a Top 5 QB, elite WR, and a defense that was facing the league's 3rd-easiest schedule of offenses. Without a passing threat to keep defenses honest, we'd have been unable to commit to the run. Without a schedule full of turnover-prone teams, we'd have been behind more, and forced to pass more often.
And my problem with this kind of analysis is that it completely discounts the fact that in football, and sports in general, 'winning' can be a result of will, or power, coaching or even luck.
It's not any specific kind of analysis, it's just analysis. Looking at the result of every play, and then drawing your conclusions afterward. If your team is lucky, strong-willed, powerful, or blessed with great coaching, that will be reflected in the play on the field. And whatever role those elements may have played, you're going to get some numbers at the end of it that generally show you that the team that was more successful passing and stopping the pass was the team that won.