SANTA CLARA — Nick Bosa’s torn ACL was a gut punch to the entire 49ers’ roster.

“I’m sick. I’m so sick for him,” linebacker Fred Warner said Wednesday.

But the season-ending injury to the Niners’ All-Pro defensive end is also a call to arms for this team’s offense, which has been middling at best this season.

We all understand why the Niners’ offense isn’t firing on all cylinders right now. It’s hard to move the ball when three of your five starting offensive linemen are on the injury report every week, and you’re also playing receiver roulette and, oh yeah, your All-Pro tight end — the fulcrum of the offense — is sidelined, too.

Not to mention the starting quarterback has been out for the last two games as well.

All this to say that the Niners get a pass, if not a commendation, for b

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