I understand that's what he means, or at least thinks he means. But I believe he is wrong. I doubt there are any CTers who don't believe in multiple CTs. I can produce empirical studies that show this to be the case. It is my personal experience. It is a generally help position on this forum.
I'd say it's up to him to show me these uni-CTers.
Except that he's not saying there are any "uni-CTers." He's observing (correctly IMHO) that Mr. Fetzer not only believes in multiple CTs, he believes in the fringe of the fringe of the fringe for all the multiple CTs.
I read it as - within each CT there is a mainstream for that CT, and Fetzer is at the fringe for multiple CTs.
Just checking, given your occasional use of Poe-as-learning-tool -- are you being serious here?