Daas Yochid,
I also don’t see the teshuva from the ????? ?????? to be immaterial, but I can’t say that it was R’ Moshe’s intended public psak.
I see how you are leaning pshat in the teshuva in the Igrod Y”D 5. I think that it would take a real buki to determine who those “Yechidim” are. Until then, Teiku.
And until the next shipment of C”Y comes to my far OOT community, I’m drinking soy milk.