To Any
If you want to limit this discussion to the question of whether Moshiach can come from the dead then I would agree that it’s possible. I would add, however, that it’s quite unlikely since the Chofetz Chaim Paskened otherwise. This said there are a couple of problems to address. First, a significant percentage of Lubavichers say that the Rebbe is Moshiach. We therefore have an intrinsic contradiction. Second, if you’ll say that those who proclaim that the Rebbe is Moshiach are wrong then you must explain why Lubavichers, including yourself, are convinced that it’s the Rebbe who will have a second coming. If neither question is answered then this thread serves no purpose.