A s the Kansas City Chiefs look to defend their legacy in the 2025 NFL season, much of their fate may rest not just on the talent of Patrick Mahomes , but on the performance of two crucial offensive line positions.

With several offseason changes and lingering questions, the left and right tackle spots have become the most pivotal areas to watch.

Star guard Joe Thuney's departure to the Chicago Bears has triggered a reshuffling across the offensive line. Jaylon Moore , a career backup with limited starting experience, is now stepping into the vital left tackle role. Meanwhile, Kingsley Suamataia, who struggled as a tackle in 2024, is being moved inside to left guard. These moves come with inherent risk and little margin for error in a season where Mahomes' protection is paramount.

Adding further complexity is rookie Josh Simmons , the Chiefs' first-round pick this year, who is still recovering from a significant knee injury.

While highly touted, it's uncertain whether Simmons will be ready to make a real impact in 2025. Ideally, the long-term plan seems to be Simmons at left tackle and Moore shifting to the right, but that configuration may not materialize until 2026.

Jawaan Taylor's penalties and the pressure to perform

On the right side of the line, Jawaan Taylor remains the starter. While he brings experience, his consistency has been a major concern. Over the past two seasons, Taylor has been flagged for a staggering 28 penalties, often stalling drives and putting extra pressure on the offense.

For Kansas City to make another deep playoff run, Taylor must show marked improvement in discipline and technique.

Last season's Super Bowl performance exposed the offensive line's vulnerabilities, as Mahomes faced relentless pressure from the Philadelphia Eagles' defensive front. That experience left the front office with no choice but to rethink their approach in the trenches.

But with so many new or unproven pieces, the chemistry and performance of this group remain an open question.

The AFC West appears to be improving across the board, meaning Kansas City can't afford a slow start or prolonged adjustment period. This season presents a new challenge for the Chiefs-proving skeptics wrong in an era when their dominance is no longer guaranteed.

If the offensive line-particularly the tackle positions-can find stability and protect Mahomes, Kansas City will remain a formidable force. If not, even their generational quarterback may find it hard to overcome the pressure. The 2025 campaign will likely rise or fall with these two key positions.