Assuming it's the same Scott Shadle, he used to be a fairly regular contributor to the Alfa Digest. I think he worked at the NHTSA or something, he'd weigh in with real data from time to time on various discussions.
While I've never bought or sold anything from/to him, I've always had pleasant dealings with him. Met him once in person, I think at the Alfa Watkins Glen event a few years ago.
Too bad things aren't going so well on EBay, doesn't sound like the guy we all used to know..
bs