Please tell me how in the world some gedolim can hold others are not gedolim? Gedolim are Gedolim.
I don’t understand the question. Is there some list of gedolim somewhere, written by Eliyahu Hanavi, which nobody can disagree with?
I would be really surprised to hear that gedolim just say that ‘the Lubavitcher Rebbe isn’t a Gadol’ just because they disagree.
Wouldn’t that depend on what it is they disagree with?