With the San Francisco 49ers trading for Keion White, fans should look to a past Robert Saleh pupil for a best-case scenario ...

Thanks to coordinator Robert Saleh, the San Francisco 49ers have fielded an effective defense despite devastating injuries.

Saleh might have been the 49ers' top offseason acquisition, and no NFL assistant coach has made a bigger impact this season.

The Jacksonville Jaguars found a way to upset the previously undefeated San Francisco 49ers on Sunday, 26-21, but there was some interesting -- and not-safe-for-work -- action after the final whistle.