“As far as R’ Aharon Lichtenstein, he is a very nice man, but his arguments are based on feelings, not logic. It is not in his place to decide who is L’shem Shemayim and who is not. Can you go into any Yeshivah and honestly point out who is l’shem Shimayim and who is not? Who gave anyone the right to put a limit on this din? The Rambam didn’t, so how can he say maybe 5%, 10%, etc. It’s a case by case situation.”
What about his argument is not logic? And there is a difference between saying someone is not lesheim shamayim and saying that they are not “sanctum sanctorum, in the Rambam’s terms”. It would not be such a big chiddush that there are not 66,000 people on this level.