I have not seen details of how Buckhead was identified- beats me. Although I have never placed any store in the alleged anonymity of the web- as an old DOS man, I can see ways to bypass security.
I don't think it has anything to do with security on this site - bypassed or otherwise. either he provided enough information in his posts or his profile for his identity to be determined, or he "outed" himself. can anyone point to a post where he IDs himself? just being a lawyer from Atlanta still leaves a pool of tens of thousands of possible people.