As if your head wasn’t already spinning from this cursed 49ers preseason, I have some bad news to deliver: things are about to get even crazier.

Every NFL team needs to be down to a 53-man roster by next Tuesday at 1 p.m. And while the 49ers might seem to only have 53 active players on their training camp roster because of injuries, that cut-down deadline is not a welcome sight.

Who is in, who is out? John Lynch and Kyle Shanahan have their work cut out for them, with only three more practices and one more preseason game to help guide their decisions.

Here are the five biggest questions remaining for the Niners heading into the final week of the preseason:

Does this team have any viable backup guards?

Things were tough enough for the Niners when starting left guard Ben Bartch went dow

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