San Francisco 49ers: Early 53-man roster predictions for 2018

SANTA CLARA, CA - DECEMBER 24: Jimmy Garoppolo #10 of the San Francisco 49ers signalsto his team during their NFL game against the Jacksonville Jaguars at Levi's Stadium on December 24, 2017 in Santa Clara, California. (Photo by Robert Reiners/Getty Images)
SANTA CLARA, CA - DECEMBER 24: Jimmy Garoppolo #10 of the San Francisco 49ers signalsto his team during their NFL game against the Jacksonville Jaguars at Levi's Stadium on December 24, 2017 in Santa Clara, California. (Photo by Robert Reiners/Getty Images) /
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GLENDALE, AZ – OCTOBER 01: Defensive tackle DeForest Buckner #99 and defensive end Arik Armstead #91 of the San Francisco 49ers react after a defensive stop during the second half of the NFL game against the Arizona Cardinals at the University of Phoenix Stadium on October 1, 2017 in Glendale, Arizona. (Photo by Christian Petersen/Getty Images)
GLENDALE, AZ – OCTOBER 01: Defensive tackle DeForest Buckner #99 and defensive end Arik Armstead #91 of the San Francisco 49ers react after a defensive stop during the second half of the NFL game against the Arizona Cardinals at the University of Phoenix Stadium on October 1, 2017 in Glendale, Arizona. (Photo by Christian Petersen/Getty Images) /

Defensive Line (10)

1-Technique: Earl Mitchell, D.J. Jones,

3-Technique: DeForest Buckner, Sheldon DayJullian Taylor

5-Technique (Big End): Solomon Thomas, Ronald Blair

LEO: Arik Armstead, Cassius Marsh, Jeremiah Attaochu

Defensive lines today are more about practical rotational depth than bona fide starting positions. Just ask the defending Super Bowl champions, the Philadelphia Eagles, how important their D-line rotations were last season.

About the only non-rotating pieces are defensive tackle DeForest Buckner, whose 90.4 overall Pro Football Focus grade ranked second among all 49ers defenders last year, and nose tackle Earl Mitchell.

San Francisco has some pure edge defenders in Cassius Marsh and Jeremiah Attaochu, who may not be elite, but are about as close a natural fit for the LEO spot as there is on the roster right now. Second-year pro Pita Taumoepenu will have to beat out one of these two to earn a spot during the regular season, but that seems like a bit of a stretch.

But in terms of sheer pass-rush potential, it makes sense for San Francisco to give 2015 first rounder Arik Armstead a look. The Niners picked up his fifth-year option recently, and they’re hoping he can transform from an interior rusher into more of an outside threat after missing 11 games with a hand injury last season.

Armstead may be rotated inside on run downs, though, as 2017 No. 3 overall pick Solomon Thomas assumes the EDGE.

It’s a rotation, so don’t get married to set positions. The key, however, is maximizing each player’s effectiveness.