49ers add Dre Greenlaw and Osa Odighizuwa with hope of stronger run defense in 2026

The San Francisco 49ers are betting that their run defense can take a meaningful step forward in 2026, and the clearest roster targets are two defensive additions: linebacker Dre Greenlaw and defensive tackle Osa Odighizuwa. The idea, as framed by Yahoo Sports, is that specific front-seven changes can tighten the middle of the defense and improve discipline against power and gap-based rushing attacks.

According to the offseason moves discussed in the report, San Francisco used cap space to sign wide receiver Mike Evans, retooling parts of its offense while still prioritizing defensive needs. On defense, Greenlaw is the marquee emphasis for the unit’s interior-and-second-level play, while Odighizuwa is the tangible piece meant to strengthen the defensive front. The 49ers also made a trade that brought Odighizuwa into the organization, giving the team a new body to help set the tone at the line of scrimmage.

In practical terms, a run-defense improvement often hinges on two things. First is the ability to consistently win leverage battles and hold ground in the center, so running lanes are cut off earlier. Second is the capacity for defenders to read and react quickly once the play is committed, especially on plays that threaten the second level. Greenlaw’s role as a linebacker places him at the center of those second-level responsibilities, where angles, run fits, and flow to the ball can determine whether big gains become short, and short gains stay short.

Odighizuwa’s value is linked to the other half of that equation: the trench work. A defensive tackle can affect the run by occupying blockers, creating double-team pressure, and forcing the offense to adjust its blocking scheme. Even without making a claim about specific 2026 statistics, adding a defensive tackle through a trade indicates San Francisco believes it can improve how opponents are met at the line, which is usually the foundation for better down-to-down run stopping.

It also matters that San Francisco’s defensive identity has long been built around tight execution and physicality, attributes that are typically emphasized in linebacker-and-front development. When a defense improves its run fit, it often changes the entire ecosystem for the secondary, because fewer broken coverages follow when the run game is stalled earlier. The expectation for 2026, then, is not just a single matchup upgrade but a more stable week-to-week defensive baseline.

That said, roster additions do not automatically erase schematic problems or personnel gaps. Run defense outcomes depend on continuity in assignments, health, and how well the front and linebackers synchronize their reads. Greenlaw and Odighizuwa can be meaningful answers, but the 49ers will still be judged on how quickly they can translate the talent into consistent play against a wide range of rushing styles.

Beyond the defense, the Evans signing indicates a broader team-building posture: shore up the offense while turning the page on the defensive front. If San Francisco can combine better run stopping with a stronger passing threat, it can help its defense by controlling game script, reducing how often it is forced to defend in obvious passing situations late in drives. The next watch item is how the defensive staff uses these players in camp and the preseason to establish a reliable run-fit rotation.

Key offseason additions provide the 49ers with an identifiable path to improvement, with Greenlaw aimed at the linebacker run fits and Odighizuwa aimed at the defensive interior. If that plan holds through training camp and the regular season, San Francisco’s 2026 profile could look more like a defense that dictates the run early and keeps opponents from settling into their preferred ground-game rhythm.