Of all the features of the 49ers team that has enjoyed continual success under Kyle Shanahan, arguably none has been more impressive than San Francisco’s sustained elite level of performance on defense.
Since its 2019 ascension with Robert Saleh under defensive coordinator, the 49er defense has remained in the top five in the NFL. It has maintained that status through the end of Saleh’s stay and the transition to DeMeco Ryans, the second and final year with Ryans as DC perhaps representing the zenith for the defense
The 2023 season, however, may represent the most significant challenge for the 49er defense in the Shanahan era.