PE,
Out of curiosity what are the specifics on your brother? I ask because I can't imaging anyone who has made a success out of their life for the past 15 years away from this dreaded cult ever considering going back to it.
My guess is that he has little to no college, is lower middle class and struggling financially, has difficulties in maintaining quality relationships and finds it challenging to discipline and control himself in what he eats, drinks, ingests, how he spends his money . . .