This is our mesorah? Where is that written? U wanna quote me a ramban I’ll quote u an abarbanel. U wanna quote me some rov today I’ll quote u a different rav. These things have always been an argument it’s frankly a rewriting of history to think Jews have all been in agreement on all these details.
The Gemaras MAJORITY interpretation actually from achronim and rishonim is some sort of min hameisim at some time even if not now. Idk what mefarshim u are reading. The Gemara isn’t a stira to rambam at all for anyone who knows how to read which unfortunately isn’t many people. The Gemara is saying if someone resurrects at the keitz to become moshiach and do his mission who will it be. The Rambam is saying if someone died during his mission at the keitz it shows he isn’t on any real mission at all. Those are entirely different points. Not to mention rambam already says questions in the Gemara which are not directly Halacha lmaaseh about which the chochom disagree etc he does not paskin on.