“This is a very unique definition. Not one that I have seen shared by anyone else. Certainly not the people who you are calling MO, except perhaps Rabbi Shachter.”
Maskim. I don’t really see how you can put Rav Twersky, HY”D in the same category as Avi Weiss unless the category is Jewish and you are including all Jews (which perhaps is what we should be doing anyhow, but that’s another story).