HaLeivi,
I’m sorry but that is not how a gemara finds the answer. It does not say מסתברא. That is a word that means, most likely, but not certain. In addition, even if he was a Navi, we have a whole Sefer of Ezra and not one nevuia regarding the geula? Think with your gemara cup! Does that make sense?!?! The pivitol moment when Jews can go back, and not ONE neviah?
We are in a zeman similar to when Jews had to leave Mitzrayim and Bavel. There is no Neviah, but the timing is right. It seems you have chosen to remain in Mitzrayim and Bavel. That is your right. It is even your right to criticize people who believe in the Geula. But it still wont make you right! You will be known as the Chamishim. As Rashi explained, the 4/5ths of Jews who remained in Egypt, even though they were being persecuted. They probably said the same thing as Satmar, that the 400 years weren’t over and even after all the miracles, they still felt Moshe was not the right leader. Most probably because he looked like a Goy, like the Torah described him, he looked like a Egyptian.
So I will follow the goyish Zionists to the Land that Hashem promised our Avos. That’s that!