*EDIT: Looks like I should have refreshed before commenting, beat by half an hour :(
Also, it might be moreso a case of him wanting to get back out there. There is the option of look, if you continue playing football for the next couple years, you could do some serious harm to yourself. However, you have this one chance before you hang up your cleats to go out there for a few games and win a national championship with your brothers. I would jump at that opportunity if I knew that this would most likely be my last season and it wasn't a case of immediate, one more hit and you're done type of scenario.