
State of the 49ers, DB edition: Personnel turnover in the secondary is coming
New York TimesWith the season over for the 49ers, David Lombardi and Matt Barrows are teaming up for an eight-part series that looks at every aspect of the team’s roster. In 2019, coordinator Robert Saleh’s secondary didn’t stray too far from the Seattle Cover 3 model: Per TruMedia, the 49ers ran zone defense 72.5 percent of the time, a rate that trailed only the Chargers and Seahawks — their schematic siblings. Saleh’s plan came to fruition in 2019, when the 49ers’ pass rush roared and the back end primarily rode Cover 3 and Cover 4 to results similar to those of Seahawks defenses from several years prior — all the way down to success from cornerback Richard Sherman. Perhaps this was most apparent through the pass defense’s improved efficiency in Cover 1 — even with a worsened pass rush: The 49ers ran 33 more snaps in a Cover-1 defense in 2020 than in 2019. 2020 49ers defensive backs DB Cover Snaps PASS YDS/SNP RTG MTKL% Verrett 466 0.97 76.2 6.3% Moseley 248 1.69 98.8 11.3% Witherspoon 173 1.02 82.4 4.8% Sherman 202 0.99 116.2 10.0% Johnson 96 2.08 100.3 17.9% Allen 15 8.27 158.3 0 Williams 91 0.91 81.9 12.0% Taylor 60 2.92 69.1 4.3% Ward 469 0.80 105.9 2.7% Tartt 205 0.33 89.6 6.3% Moore 305 0.83 156.2 8.8% Harris 119 1.80 137.5 9.8% PASS YDS/SNAP takes two numbers — a DB’s total snaps in pass coverage and the pass yards he gave up — and divides them to calculate efficiency in pass defense.
History of this topic

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