The 49ers just made an interesting change to their offensive coaching staff. They promoted assistant passing game specialist Klay Kubiak to offensive coordinator. It's unclear how Kubiak's job will change.

The San Francisco 49ers have removed Nick Sorensen from his role as defensive coordinator and promoted passing game specialist Klay Kubiak to offensive coordinator, coach Kyle Shanahan said Wednesday.

The 49ers have only had one other offensive coordinator by title since Shanahan joined the team: current Dolphins head coach Mike McDaniel

Shanahan and Kubiak have long-time ties as their fathers worked together for years. Klay's father Gary, worked under Shanahan's father Mike for more than a decade. Mike Shanahan w