Dolphins adjust edge rotation, signing Seth Coleman-Lyles and waiving/injuring Mason Reiger

The Miami Dolphins announced a pair of transactions that reshuffle their defensive end and edge-rusher group. Miami signed edge Seth Coleman-Lyles and, in a corresponding move, waived/injured edge Mason Reiger, according to the team’s official roster announcement released on August 18, 2026.

The signing of Coleman-Lyles adds another option to the Dolphins’ outside front, an area the club has emphasized as a pressure-generating unit. In roster terms, edge spots often carry multiple roles depending on the defensive package, including rushing the passer in sub packages, setting the edge against the run, and providing rotational depth when teams shift personnel across downs.

Reiger’s waived/injured designation indicates that the Dolphins and Reiger are operating through the league’s injury and waiver framework. While the specific nature of any injury was not detailed in the team announcement, the procedural label generally means a player is being exposed to waivers with an injury component, after which his immediate football situation is determined by how other teams handle the waiver process.

For a team building toward the regular season, moves like these are typically about managing two competing realities: maintaining enough bodies to support the rigors of training-camp and preseason workload, and creating roster flexibility as evaluations continue. Edge depth is especially scrutinized because it affects snap distribution for multiple defenders, and because the unit can be reshaped quickly if a team needs to prioritize speed, power, or run-stopping traits.

Coleman-Lyles’ arrival gives Miami another look at his skill set within the Dolphins’ defensive ecosystem. For fans and evaluators, the immediate question is how quickly a new edge player can learn assignments and fit into how Miami communicates on the line of scrimmage, including leverage, responsibilities against play-action, and how rush lanes are identified in real time.

Reiger’s status also matters, even without additional detail. A waived/injured move can impact how the roster is balanced for the weeks ahead, including whether Miami ultimately retains Reiger’s rights through the proper process or whether the player’s status changes after the waiver window. Either way, it can alter the mix of edge rushers available during camp’s closing stages.

The Dolphins’ transactions underline a common offseason theme across the NFL: roster construction is not only about top starters, but also about the supporting cast that can keep the front competitive through practice intensity and game-week adjustments. As preseason snaps and roster cut deadlines approach, Miami’s ability to evaluate multiple edge profiles will likely determine the final shape of the outside rotation.