PFF's Week 6 grades might indicate how the San Francisco 49ers' defense will fare without All-Pro linebacker Fred Warner for the rest of the season.

All-Pro LB Fred Warner went down with a serious injury on Sunday that no one wanted to see, especially Todd Bowles.

What we learned as Fred Warner injured in 49ers’ tough road loss to Buccaneers “The 49ers believe they have good depth at linebacker. They do not need second-year pro Tatum Bethune to be Fred Warner. They just need him to be a solid player who can hold his own in the middle of Robert Saleh’s defense.”