I see. I just don't understand how he would be back in the room with the team and possibly competeing at the scuffle if he were greyshirting. Maybe dice could offer some insight?
Being back in the room and practicing with the team does not effect the greyshirt.
Only competition is prohibited after the grace period. Athletes may still train and practice with a team or coach indefinitely after they graduate high school, so long as he or she does not appear in organized competition. Competition is on a yearly basis. If you play one game during a year, it is the same as playing an entire season.
Dinmore did the same thing a few years back. Enrolled 2nd semester, was on roster and competed unattached. Came back the next year with trFR eligibility. Delaying a single semester will have the effect of pushing the clock back a year - as long as he doesn't compete attached. If he is granted the medical exemption, that's basically what he is doing.
I'm not sure what the Scuffle rules are. I know it is not an open and more an invitational, so that is up to the Scuffle. They may allow him, they may not. I don't know.