@benToiroh There is a simple solution to this argument that everyone is ignoring. Ask any non-Chabad Rov if they believe if the late Rav MM Schneerson ZT”L can be Moshiach. They will overwhelmingly answer in the negative. Press the issue and ask if it is within the boundaries of emunah to believe so. They will mostly answer that yes, it is a problem emunah wise if one believes that.
What this means, is that we can split Torah fearing Jews of Klal Yisroel up into two camps: Those that have no problem accepted that a dead man can be (or is) Moshiach, and those that say absolutely not. At this point, it isn’t even an “Elu v’Elu Divrei Chaim” question, since the side that rejects the messianism believes the other side to be following a non-Torah path.
So we are left with a choice. You can follow the Torah as it’s been interpreted and accepted by all of our Rabbonim since forever. Or you can follow a small subset of Rabbonim that have broken away from the klal and are no longer accepted as being part of it.