San Francisco 49ers: Predicting the secondary depth chart after 2018 NFL Draft

SANTA CLARA, CA - OCTOBER 22: Richard Sherman #25 of the Seattle Seahawks reacts to a play against the San Francisco 49ers during their NFL game at Levi's Stadium on October 22, 2015 in Santa Clara, California. (Photo by Ezra Shaw/Getty Images)
SANTA CLARA, CA - OCTOBER 22: Richard Sherman #25 of the Seattle Seahawks reacts to a play against the San Francisco 49ers during their NFL game at Levi's Stadium on October 22, 2015 in Santa Clara, California. (Photo by Ezra Shaw/Getty Images) /
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SANTA CLARA, CA – NOVEMBER 26: Ahkello Witherspoon #23 of the San Francisco 49ers breaks up the pass to Tyler Lockett #16 of the Seattle Seahawks during their NFL football game at Levis Stadium on November 26, 2017 in Santa Clara, California. (Photo by Thearon W. Henderson/Getty Images) /

Boundary Cornerback

Left Cornerback: Richard Sherman

Right Cornerback: Ahkello Witherspoon

Backups: Tarvarius Moore, Tarvarus McFadden

On paper, it looks as if the 49ers have their starting cornerback tandem set with Richard Sherman and Ahkello Witherspoon assuming the Nos. 1 and 2 spots outside.

But Sherman, who just turned 30 years old, is coming off a serious Achilles injury last year. He’ll likely be ready to go by Week 1, but there’s going to be a need for adequate depth and an eventual long-term replacement.

So it only makes sense the Niners drafted defensive back Tarvarius Moore out of Southern Miss in Round 3.

Moore primarily played safety in college. But with a 6-foot-2 frame, long arms and sub-4.40 40-time speed, it’s no surprise San Francisco is looking at him as a possible cornerback:

He’ll make the roster and likely serves as a No. 4 defensive back, supplying depth to both boundary corner and the safety position.

Yet one of the more intriguing pickups, Florida State’s Tarvarus McFadden, happened after the draft. McFadden, a UDFA grab, should have been drafted. At 6-foot-2 and 204 pounds, he also embodies the prototypical outside corner ideal for coordinator Robert Saleh’s defense.

It would be something of a shock if McFadden doesn’t crack the 53-man roster this season.