He makes everyone around him better. It's not going to take him months to resurrect that great hand-eye coordination. It's safe to say he's a weapon depending on where he's at with his rehab situation.
I'd be very surprised if he participates between now and the season's end. First, there's the health, and second, with 20 games left, there's no place to rehab with live pitching. It would be unfair to put him into the lineup without seeing live pitching.