To n0mesorah
It’s not exactly correct that Rav Dovid humbled himself. This is who he was. He didm’t consider himself superior to anyone
And he learned this from his father. Once Rav Moshe was walming to MTJ and he heard a woman call out Mosishie(she was addressing her son who was also going to the Yeshiva). Rav Moshe turned around thinking that the woman was calling him
To CS
You ask why it’s hard to fathom Hashem handing the world’s car keys to the Rebbe. Aftsr all that’s what will happen when Moshiach comes. Yes tjat’s what will happen when Moshiach comes. But tjete are no Moshiach tryouts. Hashem knows who will take the reins. Sometime hopefully in the non too distant future.