In 2020, the Buffalo Bills played 91 percent of their defensive snaps in a nickel defense. Essentially, that made the nickel the base, as the Bills went with two linebackers and five defensive backs more often than any other team in the league.
This underscores the notion that the NFL is now more than ever a passing league, and the Bills showed that they were ready to defend the pass by matching their personnel accordingly. It also helps that the Bills have two linebackers who are equally adept at stopping the run as they are at thwarting passing plays.