Why did God bury Moses........?

Because Moses was very popular probably. God didn't want people to find his grave lest they start worshiping his bones and sin against him. That's probably why we haven't found Anything from the OT. Imagine what would happen if we found the grave of Moses today. Most religious leaders would be rubbing their hands together with glee at the thought of all the money to be made from exploiting it. Of course this is only my opinion.

Two sources describe "why did G-d bury Moses.

1) Classic Commentary on Deut 34:6 exegesis of Hebrew OT

2) Midrash Rabbah on Deuteronomy

Classic Commentary

"And He buried him"

i.e., The Holy One, blessed is He, Himself, in His very glory [buried Moses]. — [Sotah 14a] Rabbi Ishmael, however, says that [the words“And he buried him” mean that] Moses buried himself. And this אֶת in the phrase here וַיִּקְבֹּר אוֹתוֹ is one of the three instances of the אֶת in Scripture which Rabbi Ishmael expounded on in this way [i.e., where the suffix attached אֶת is understood to be reflexive, meaning “to himself” , “to themselves” , and so on]. And similar to this case [are the following two instances]:“On the day when his Nazirite vow is completed, he must bring him (אֹתוֹ) ” (Num. 6:13), which means, “he shall bring himself” [i.e., present himself]. And likewise,“And they cause them (אוֹתָם) to bear the sin of their guilt” (Lev. 22:16). Surely does this refer to others causing them to bear that sin? Rather, the verse must mean that they cause themselves to bear the sin. — [Sifrei Nasso 32:124]

Midrash Rabbah

Moses was the greatest of men. His prophecy was of a higher order than that of all other prophets. He was closer to G-d than any human being ever was. G-d Himself took his holy soul to heaven and buried his body in a cave, hidden from all human eyes.

Nobody was looking. It was a reference to how Moses killed and buried the Egyptian in the sand, before he fled from justice. Like Moses, God has never been held accountable for his crimes.

Outside of Jesus, what other Jewish leader deserved it?