Even though I went to a school with a TON of fraternities and was friends with a handful of fraternity men, I literally have never asked about how recruitment works for fraternities and the only insight I have into it is what I have grazed over on GC. Aside from SECDomination's recruitment story, this is the first fraternity recruitment story I have read (the first current one--and so far your sons's story is way different from his) so I'm definitely intrigued!
I hope your son gets a bid from a great house.