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How far has the 49ers defensive line fallen heading into 2025?

Under Kyle Shanahan, the San Francisco 49ers have been known for their offensive prowess and defensive line power. In 2019, the 49ers boasted a defensive line of Nick Bosa, DeForest Buckner, Arik Armstead, and Dee Ford as their best pass-rushing unit.

Kris Kocurek and the two best defensive coordinators (Robert Saleh and DeMeco Ryans) during Shanahan’s time have been able to generate defensive line power with players who possess desirable traits but have been unable to translate those traits into success in the NFL. Think Charles Omenihu and Arden Key.

Fast forward to 2025, and Saleh has returned, but the only constant player who can set their watch to is Bosa.