We hear it all the time. The NFL is a passing league. You have to pass the ball and defend the pass well to win in this league. Running backs don’t matter. Stopping the run is less important than stopping the pass. That’s the conventional wisdom these days, but is it true?

As it happens, the league has quietly undergone an extraordinary transformation over the last decade or so. In 2015 the league set an all time record of 244 passing yards per game. Passing offenses seemed unstoppable. 13 NFL teams surpassed 4000 passing yards that year. Even the Jets got in on the fun, passing for 4057 yards. Everybody was trying to figure out how to slow…

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