I remember reading in one of Father Cekeda's (I've read them all and enjoyed them all, including the ones where I had a slight disagreement) articles that he identified at a totalist, I think with a "yours truly". That he was opened to the possibility of the Cassiciacuм theory I suppose was possible.
Heiner seems to have an issue with the theory being called novel unless I misread him. But it is a novel theory. I'm not sure how that can be debated. I'm not sure how a mere layman stating that fact makes it "less true".