Can Purdy Throw?

Brock Purdy couldn't throw. Josh Johnson bangs his head on the turf in the third quarter and goes to the blue tent. He's diagnosed with a concussion. They have to bring back Purdy. Even after this discussion, as Christian McCaffrey going to be the quarterback, is Kyle Hughes checking to be the QB? There's a chance Purdy blew out his elbow. We don't know yet.