Why is God not mentioned in the opening line of Pirkei Avot?
Moses received the Torah from Sinai and transmitted it to Joshua; Joshua to the Elders; the Elders to the Prophets; and the Prophets transmitted it to the Men of the Great Assembly. [Avot 1:1]
This line establishes the legitimacy of the Jewish tradition. We have dozens of names for God, but Sinai not one of them. Wouldn't this have been a wonderful occasion to stress Who everything comes from?
The Maharal addressed the issue:
"Moses received the Torah from God" would have implied that God's ability to transmit Torah was limited to Moshe as the receiver, which is not true.
A student learns Torah from a Rav, which creates a bond between them. Saying that Moses received the Torah from God implies this kind of bond, which is not respectful of God. Even though the Torah says in many places "And God spoke to Moses saying...", this doesn't imply the bond of Rav to student.
Emphasizing that Moses received the Torah "from Sinai" shows how integral the place (Sinai) was in this process.
God was speaking "to Himself" and it was Moses' responsibility to receive the Torah. It looked as if Moses was receiving the Torah "from Sinai" since God was not required to interact with him.
Are other explanations available?
My real question is: What would have been LOST by saying that Moses received the Torah from God?