1)
What do we learn from "Sham Kevod Hashem Omed"?
1.
Rashi (from Tanchuma Bereishis 4): Hashem came before Yechezkel, amidst His excessive humility. A human Rebbi, the Talmid waits for him. Hashem waited for His Talmid!
2.
Malbim: Hashem showed him that even though the Shechinah is prepared to go to Yerushalayim to destroy it, it is still amidst the Golah, to oversee them.
2)
What is "ka'Kavod Asher Ra'isi Al Nehar Kevar"?
1.
Radak (22): It is the Merkavah. The verse did not need to explain this.
