Sorry, I had to catch up a lot after Shabbos and I can’t remember exactly who it was (possibly CS or Sechel Hayashar) who said that it was obvious (probably not the exact words used) that the geonus of the lubavitcher rebbe was unmatched?
Are you for real?
I have spoken to many talmidei chachomim of all types, Chassidish, Litvish and Sefardish, and I am yet to hear someone who things that the lubavitcher rebbe was a great geon. Many of them liked some of the verter and pshatim that he said, but that was the limit of their appreciation of his learning.
And the point so many of them brought up to prove that he was most ceratinly not such a great gaon was his lomdus for not sleeping in a sukkah. Did he really say that?