“No talmid chacham or Rov that I know says that the Lubavitcher Rebbe ZT”L wasn’t a tzaddik.”
That is patently untrue! There are many many (not a typo) Litvishe talmidei chachomim and roshei yeshivah who hold that the Lubavicher rebbe was NOT a tzaddik. And I believe there are more than one or two chassidishe talmidei chachomim who are of the same opinion.
Actually, I retract that. Maybe it is true that YOU don’t know them… but it’s definitely true that I do.