Analytics have a way of upsetting your sensibilities and upending some preconceived notions. Growing up, we’ve been conditioned to believe that pass rush is critical. And for good reason—pressure reduces passer rating substantially (by about 30 points) and nearly halves a team’s yards per play average. And we can see from the broadcast angle when pressure affects a quarterback. Because passing is so important, good pass-rushers have been the highest-paid members of most NFL’s defenses.
However, we found that not only does pass coverage (as measured by PFF grades) explain team success better than pass-rushing, but predicts it better as well. This helps explain why the winningest team in the league (New England) has used its only two big-name defensive free-agent signings on cornerbacks over the past decade (Stephon Gilmore and Darrelle Revis), and why defensive end Trey Flowers is currently a Detroit Lion. One need only to go back to last year’s playoffs to see how the quick passing game of today’s NFL mitigates even the strongest pass rush, with the Patriots racking up 78 points en route to the Super Bowl despite facing the vaunted pass rushers on the Chargers and Chiefs.
The caveat to this finding? As a trait, coverage tends to be less stable year to year. The upshot? Invest a lot into coverage, so that some subset of five or six of these players give you an elite group.
