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.

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.

Robert Saleh didn’t get the job he wanted, but the job he accepted could lead to a gig he desires next year. Saleh rejoined the San Francisco 49ers as their defensive coordinator Friday and the announcement was made shortly after the last of the three head-coaching openings for which he was a candidate was filled.

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