San Francisco 49ers linebacker Fred Warner didn't hide his excitement for the return of defensive coordinator Robert Saleh, but there were things he didn't say that illustrate what Saleh's return means for the 49ers' defense.

Reflecting on Robert Saleh's time with the San Francisco 49ers, Jacksonville Jaguars' Arik Armstead explains what made him an effective coach

Saleh, who was fired in October as the New York Jets head coach five games into his fourth season, generated interest on the head-coaching front and was seen as one of the frontrunners for the Jacksonville Jaguars job. He also interviewed with the Las Vegas Raiders and Dallas Cowboys.

The San Francisco 49ers have long established their strong defensive identity, and with Robert Saleh back at the helm

Later on Thursday, then-Tampa Bay Buccaneers offensive coordinator Liam Coen had a change of heart, the Jacksonville Jaguars quickly moved to hire him as head coach and Saleh, who told Kyle Shanahan and John Lynch that he’d return to the 49ers if he didn’t get a head-coaching job, stayed true to his promise.

The San Francisco 49ers and head coach Kyle Shanahan announced that Robert Saleh has been named as the team’s defensive coordinator.

The biggest concern surrounding the San Francisco 49ers' reunion with Robert Saleh is the possibility of him becoming the team's third consecutive one-and-done defensive coordinator.