I had thought +Des Lauriers was the first to espouse the anti una cuм position
Although I did not mention him, I believe you are correct. That is why +Sanborn also espoused it. +Sanborn was aligned with +Des Lauriers on the Cassiciacuм thesis (Materialiter-Formaliter), too. I always found it odd, as The Thesis, if you will, in my mind at least, should lead one to be the opposite of anti-una-cuм.