As the NFL evolves into an offensive powerhouse, the age-old saying that "defense wins championships" remains relevant. This was evident in the last two Super Bowl matchups, where solid defensive performances played a pivotal role in securing victories. With all 32 teams dedicated to enhancing their defensive units during the offseason—whether through free agency or the draft—many defenses could look significantly different when the 2026 season kicks off.

Improvements and Risks Across the League

While teams like the Seattle Seahawks and Houston Texans solidify their status as defensive stalwarts, others such as the Cincinnati Bengals and Dallas Cowboys continue to grapple with consistency. Here's a look at the best- and worst-case scenarios for various defenses as the 2026 NFL season approaches.

Arizona Cardinals

Best Case: Ranked 27th in total defense last year, the Cardinals have plenty of room to grow. With Josh Sweat aiming to build on last year’s impressive 12 sacks, support from linebackers Mack Wilson Sr. and Cody Simon, and the hope that second-year cornerback Will Johnson can thrive after the loss of safety Jalen Thompson, the Cardinals could crack the top-20 defenses.

Worst Case: Conversely, the lack of support for Sweat could render the pass rush ineffective. Concerns linger about the weak linebacker duo, and with an average safety like Andrew Wingard replacing Thompson, the defense could regress further, possibly mimicking the struggles of the 2025 season.

Atlanta Falcons

Best Case: After showing improvement last season, the Falcons hope to continue that trend in 2026. A top-tier pass rush, along with seamless replacements at key positions, could solidify the roster and elevate the defense as one of the best in the NFC South.

Worst Case: If leading sack artist James Pearce Jr. faces suspension for off-field issues, the pass rush is significantly weakened. With their run defense ranked 24th last season, further difficulties in this area could hinder the Falcons' chances for improvement.

Baltimore Ravens

Best Case: The Ravens addressed their weaknesses in the offseason by signing edge-rusher Trey Hendrickson. If he recaptures his prior dominance and the secondary can perform reliably, the Ravens could potentially field the best defense in their division.

Worst Case: However, if Hendrickson fails to return to form after a subpar season, and with previously strong performances faltering, Baltimore may once again struggle in the secondary, jeopardizing their defensive stability.

Buffalo Bills

Best Case: Following an impressive performance last year, the Bills aim to maintain their top-ranked pass defense while improving their run defense, which faltered at times. If new blitz strategies and player health align, the Bills can expect another strong defensive season.

Worst Case: Injury setbacks could derail their improvements, especially if key contributors are unable to replicate their previous performances. A leaky run defense could resurface, and the result could be an unchanged status quo from last season.

Chicago Bears

Best Case: The Bears desperately seek improvement after allowing ample yards last year. Acquiring new talent and retaining essential pieces could yield marginal gains, setting the stage for a competitive season.

Worst Case: Yet, regressions in the pass rush and secondary could spell disaster. Without firm improvements, Chicago could see itself trending towards a bottom-five ranking defensively.

Cincinnati Bengals

Best Case: The Bengals made aggressive moves to bolster their defensive line this offseason with several trades and signings. A move into the top-20 defense could set them up as AFC contenders if they click.

Worst Case: The risk of failing to bounce back from last year’s poor performance looms large. Question marks persist, especially if injuries or underperformance hinder the highly-touted newcomers.

Dallas Cowboys

Best Case: After an overhaul of the defensive unit, if the new talent meshes well and elevates the unit’s performance, the Cowboys could transform from a liability into a competitive defensive force in the NFC East.

Worst Case: Without guaranteed success, the potential exists for these changes to fail to make an impact. With foundational issues, this unit could easily repeat last year’s performance or worse.

Denver Broncos

Best Case: As one of the league's stellar defenses last season, a repeat performance would solidify their status among the top defensive units.

Worst Case: The absence of key players or downturns in performance could lead to decreases across the board as they compete for postseason hopes.

Conclusion

The preliminary stage of the NFL season is built on hopeful aspirations of defensive units across the league. With significant changes underway and teams eager to improve, the battle for NFL supremacy will heavily rely on how effectively each defense operates amid the heightened competition. While the stakes have never been higher, every defensive unit is just one injury or underperforming roster member away from their worst-case scenario. On the flip side, a solid performance could provide the foundation for a run at the championship title.