With all due respect, if someone who weighs 155 can throw 85 and run a 6.9, how physically immature can he be?
Your question is a good one, though. I think other threads on deferring college attendance have discussed not attending college with the class that you entered/(or left?) high school with. My recall of the rules posted by 3fglove was that it seemed like you could do a one year pg without affecting any eligibility, but beyond that, you started to consume your eligibility if you were involved in playing that game in any way shape or form. And that was true even if you weren't in school.
EDIT: here is the link to the prior thread I was thinking about. 3fingered glove quotes the rules.
http://hsbaseballweb.com/eve/f...=152102735#152102735