This guy is as straight an arrow as they come (although I'm not going to provide any PII on him). Betting on him to default would be a very bad bet.

I know he had to pay much more than the under-amount: fees & whatnot. So I'd assume that GM Finance cleared a profit on this deal.

Yeah, on the repo man accepting payment: I'd almost believe that happened, and he just pocketed the money & reported the car missing.