When the FAA issues an emergency revocation, they take all certificates, including the medical. He can reapply in one year. (I have seen instances with failure to report DUIs on a medical application where that gets negotiated down to 9 months before you can reapply.) So, yes, if he reapplies, he will also have to apply for a new medical. The good thing for him is already has all the experience and flight training, except for the recent flight experience, flight training, and written exam requirements for taking the check ride. So, after a year, he can knock out the reapplication pretty quickly with a few flights with a CFI, a sign off that he's ready and taking the written test again.