741,
I believe you’re the first self-identified Lubavitcher chasid to admit on this forum, “that, yes, it is in the realm of possibility that someone besides for one of the rabbeim will be moshiach”. Menachem appears to be highly allergic to this question.
If it is possible for Mashiach to come from those no longer alive, there are much worthier candidates than the Rebbe that Chabad is still fixated on, a full generation after his passing. Starting with Dovid Hamelech.