Yeah Arch's game against SJSU was... better... I guess. He also wasn't facing Ohio State's defense.
Sarkisian covered for Ewers all last year when he had a torn oblique, so it wouldn't be at all surprising if Manning is currently playing hurt.
I don't think he'd play injured, because I don't think his family and camp would want that. But football players play hurt all the time. And Arch definitely looks like something is off.