1)
Why does it say "Ben Adam"?
1.
Ibn Ezra: This prophecy was amidst Kadosh angels. Also Yechezkel is called Ben Adam for this reason.
2)
What do we learn from "l'Es Ketz"?
1.
Rashi: This vision [will be fulfilled after] many days. Malbim it says "Ki", for this is why it is hard to understand. Any prophecy for the distant future is hidden more, and requires extra Binah to understand it.
