Velma and Aries make good points. Doing three meetings in a single day isn't the same as going to a meeting every day or every other day. It's like taking three doses of antibiotics at once, when you're supposed to take them once a day. It does a lot less good than taking them as prescribed, and makes it all less effective because there's no time to digest and put what you learn into practice in between meetings. Of course, all of that is on the assumption he's got the slightest interest in staying sober, which would be debatable but for the fact that he's done everything conceivable to do things his way.
And yes, he's let everyone else navigate for him everything involved in this. Actually, he has no "skin in the game." Since everyone else has been doing everything FOR him, do you think he will blame himself next time he gets in a drinking-related jam? No, it will be your fault, his parents' fault, the program's fault, AA/NA's fault, the "system's" fault.
I think the more distance you maintain from his recovery programs the better.