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49ers Rookies Shine in Training Camp as Defensive Line Overhaul Takes Root

Nick Bosa’s mentorship is accelerating the rookies’ transformation into a healthier, more versatile, dominant pass-rush group before the season opener.

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San Francisco 49ers’ Mykel Williams (98) and San Francisco 49ers’ Nick Bosa (97) talk during practice at the 49ers training camp at the practice facility at Levi’s Stadium in Santa Clara, Calif., on Thursday, July 24, 2025. (Doug Duran/Bay Area News Group)

Overview

  • The 49ers used early draft capital on Mykel Williams (first round), Alfred Collins (second round) and C.J. West (fourth round) to rebuild a front that struggled during last season’s 6-11 campaign.
  • C.J. West has dominated one-on-one pass-rush drills, routinely overpowering offensive linemen and exceeding expectations for a fourth-round pick.
  • Mykel Williams has demonstrated comfort attacking both inside and outside gaps, giving the defensive line added flexibility.
  • Alfred Collins has rebounded from a spring calf injury to participate fully in padded practices and show marked improvement.
  • Under defensive coordinator Robert Saleh and line coach Kris Kocurek, the rookies leverage veteran Nick Bosa’s guidance and peer collaboration to refine their pass-rush techniques.