The San Francisco 49ers enter the 2025 season with a clear goal of bolstering their defense, which struggled with run defense and consistent quarterback pressure in the previous year. Rookies Dee Winters, Nick Martin, Mykel Williams, and Upton Stout are expected to bring fresh energy and have the potential to become key contributors to head coach Kyle Shanahan’s and the defensive coordinator’s strategies. Below is a detailed analysis of each player, their roles, and how they could shape the 49ers’ future.
Mykel Williams: A Potential DROY Edge Defender
Mykel Williams, selected in the first round (11th overall) of the 2025 NFL Draft, is one of the most highly anticipated rookies for the 49ers. With an ideal frame (6’4″, 265 lbs) and explosive playstyle, Williams is viewed as a versatile edge defender (EDGE). He excels in run defense, addressing a critical weakness for the 49ers, who ranked average in stopping opponents’ rushing plays last season.
Williams is not only strong in holding the edge against the run but also has the potential to develop into an elite pass rusher. In his final season at Georgia, he recorded 4.5 sacks and 12 tackles for loss, showcasing his ability to pressure quarterbacks. His presence could alleviate the pressure on star Nick Bosa, who is often double-teamed by opponents. If Williams realizes his potential, he has a strong chance of competing for the Defensive Rookie of the Year (DROY) award, following in the footsteps of players like Aiden Hutchinson or Will Anderson in previous seasons.
However, Williams’ challenge lies in improving his consistency as a pass rusher. He needs to refine his technique to counter experienced NFL offensive tackles. If the 49ers can maximize his skill set, their defensive line could become one of the most formidable in the league.
Nick Martin: A Powerhouse Linebacker
Nick Martin, a rookie linebacker, is in direct competition with Dee Winters for a starting role alongside Fred Warner, one of the NFL’s premier linebackers. Martin brings a blend of speed, strength, and play-reading ability. In 2023 at the college level, he recorded 6 sacks and 20 tackles for loss, demonstrating his impressive blitzing capability. These numbers highlight his ability to not only cover the field but also disrupt quarterbacks from the linebacker position.
Compared to Winters, Martin has an edge in physicality and durability, which is crucial for addressing the 49ers’ need to improve their run defense. He fits seamlessly into the 49ers’ fast and aggressive defensive scheme, particularly in stopping inside and outside runs. Predictions for the 2025 season suggest Martin could lead all rookies in tackles, thanks to his fluid movement and sharp game awareness.
However, Martin must prove he can maintain his performance in the NFL’s highly competitive environment. His competition with Winters, who also brings significant speed, will be a key storyline during training camp.
Dee Winters: A Formidable Linebacker Contender
Dee Winters, another linebacker in the 49ers’ roster, is vying for a starting spot. Winters stands out with his speed and coverage ability, but his biggest obstacle is a history of injuries. Concerns about his durability could give Martin an advantage in the race for the starting role.
Despite this, Winters has significant potential. He has shown the ability to chase down plays quickly and handle zone coverage effectively, aligning well with the 49ers’ defensive scheme. If Winters can stay healthy and improve his run defense, he could become a vital complement to Fred Warner.
The competition between Winters and Martin will be a highlight of the preseason. Regardless of who secures the starting role, the presence of both players adds valuable depth to the linebacker position, which is essential for facing the diverse offenses in the NFC West.
Upton Stout: A Hidden Gem at Cornerback
Upton Stout, a third-round pick, is a diminutive cornerback (5’9″, 185 lbs) but possesses remarkable speed and tenacity. He is projected to lead rookies in interceptions due to his ability to read passes and quick reflexes. Stout is particularly well-suited for the nickel corner role, where he can leverage his agility to cover speedy slot receivers.
During college practices, Stout consistently demonstrated his ability to stick with receivers and make precise plays on the ball. While his smaller stature may be a disadvantage against taller receivers, he compensates with grit and solid technique. With established players like Charvarius Ward in the 49ers’ secondary, Stout has the opportunity to learn and develop quickly, particularly in zone coverage situations.
Stout also has the potential to contribute on special teams, where his speed and agility could lead to impactful return plays. If he secures the nickel corner role, Stout could emerge as a secret weapon in the 49ers’ defense.
A Broader Impact on the 49ers’ Defense
The 49ers’ defense struggled last season with stopping the run and generating consistent pressure on quarterbacks. The addition of Williams, Martin, Winters, and Stout offers hope for addressing these weaknesses. Williams strengthens the defensive line, while Martin and Winters bolster the linebacker corps. Stout, with his interception and coverage skills, adds versatility to the secondary.
The 49ers’ strategy for 2025 appears centered on building a fast, versatile, and deep defense. These rookies not only compete for starting roles but also foster healthy competition within the team, pushing veteran players to elevate their performance. If Williams can develop into a reliable pass rusher alongside Bosa, and either Martin or Winters solidifies the linebacker position, the 49ers could reclaim their status as one of the NFL’s top defenses.
Conclusion
Rookies Dee Winters, Nick Martin, Mykel Williams, and Upton Stout represent a promising future for the San Francisco 49ers. With their combination of strength, speed, and technique, they have the potential to reshape the team’s defense. Williams and Martin are expected to make an immediate impact, while Winters and Stout could become surprise contributors if they overcome challenges related to durability and experience. The 2025 season will be a critical opportunity for these players to prove their worth and help the 49ers move closer to their Super Bowl aspirations.