Rest and recuperation obviously.
With time I would add in mobility stuff, especially targeting the rotator cuff. Buy some bands and do light resistance work with it. Obviously when he can do it without significant pain.
Get a foam roller. You might have to twist and turn a bit, but if you do it right you can target the shoulder muscles pretty good. This should help increase blood flow, keep everything lose....which should help with the recovery.
See a physical therapist. No need to listen to the crappy doctors. Generally speaking doctors don't know hill or beans when it comes to recuperation from injuries like that. As many on here can attest too, a good physical therapist is a God send.
If you know a massage therapist, go see him. If you don't, find out where one is. Tell him about the separated shoulder and ask him to work on it. Should help a lot with the recovery.
If you want to get REALLY serious, some people suggest contrast showers to help alleviate soreness and get blood flow going. Basically you turn the shower on as cold as you can, target the shoulder for 30 seconds, turn it on warm. Do that 5-6x. If you keep going with it, work up to 1 min cold, 1 min hot. Start with cool water as he more than likely won't be able to stand cold water. But as he gets used to it you can make the water colder.
I've done this before for injuries and it works great.
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