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.

Robert Saleh cannot personally create turnovers, rush the passer or stop the run. His return as the 49ers’ D-coordinator is no guarantee of success.

Following his dismissal as head coach of the New York Jets, Robert Saleh has wasted no time finding his next opportunity in the NFL. The former Jets leader has returned to the San Francisco 49ers, where he previously thrived as defensive coordinator.

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.

Saleh was fired as the Jets’ coach five games into this season and is now back with the 49ers, where he made his name in the NFL.

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

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 49ers and Jets both enjoyed top-five defenses under Saleh. There’s little reason to expect Saleh to stray away from what’s made his defenses elite. There also may not be m