At this point he can play next season. Not sure if he has used his RS yr yet but if he has the NCAA will grant him a medical RS, so he is good to go for next yr.
If he plays, he will lose all of that & will be lumping his entire season into one game.
IMO, he should sit, play next yr & hope his stock rises.
He wanted to come out last yr & realised for whatever reasons he was not NFL ready, would not be a 1st day pick, or whatever. Something/someone told him to stay in school & after the injury & not playing he is basically in the same spot he was last season, only a little worse now with potential doubts about his injury.