I posted this on the diyaudio forum thread. So far, Qusp has agreed with me. No response from TC (as Al termed him).
This kind of illustrates the bravado employed as modus operandi, in that he states "well known facts" as such, and no one calls him on it. In this case, it seems apparent that he has never used the dual devices, and just makes assumptions based upon theory, not reality. Maybe at one time the known quality of dual devices was true, but not from my experience, at least for what I measured for.