In Response to why many Jewish Leaders are not saying the Rebbe of Chabad is Moshiach:
The "Gedolim" (Rabbinical Leaders of the Yeshiva/Litvisher World) as well as some corrupt Rabbis in Chabad known as the KKK, are - as far as i'm concerned - Like the 10 "Meraglim" (Spies written about as the Jews Attempted to enter The Holy Land With Moses) who did not Listen to Moshe and made the Yidden (Jewish People) cry for no true good reason, causing hashem to be "angry" at them for their lack of faith in him in leading them into the Holy Land - later g-d "gave them a reason" for their crying with both temples destruction happening on that very same day the Jews Cried Because of the Fake News they swallowed by their "Leaders"- or the 70 zekenim (Elders/Sages) who did not Muster the courage to follow Moshe into Pharaoh's chamber back in Egypt.
All problems for the Jewish People in their Pursuit of Redemption starts and ends when Moshe Rabbeinu HIMSELF or the Moshe of that Generation - or in the case of our generation - the Rebbe King Moshiach Shlit"a - is not listened to - those who tell the Jewish People not to follow the Leader out of lack of faith or just straight up corruption of sorts - are like the "Dor Hamidbar" which insisted on dying in the desert, and for 40 years just walked around and did not do teshuvah - just waited to die because the light of entering the Holy Land - or in our case - the light of the established Moshiach - was/is too intense for them - as you know - every summer they just lined up buried themselves and waited to die.
Unfortunately i see today many people who cannot comprehend the changes of Moshiach - it scares them to live the good life - it scares them to have a leader - it scares them that hashem actually wants to take us out of exile - they have been praying for moshiach so much that they enjoy it - they cant stop - they don't want him anymore....
so when you think of these leaders of the Jewish faith don't be waiting for them to agree that "it is time to act and bring Moshiach" - rather look at them like you would at corrupt politicians who want to hold onto their power at the expense of the public - think of them as people who see moshiach as a threat to their power.
so what should you do? just do your thing, learn as much as you can handle about Moshiach, and remember that Hashem wants your heart. they will follow the people later, today's leaders follow the herd...