1)
What is the significance of "v'Halach Malkam ba'Golah"?
1.
Radak: This is like it says "Ki Malkam ba'Golah Yelech Kohanav v'Sarav Yachdav" (Yirmeyah 49:3).
2.
Malbim: This includes the Avodah of Molech and their king ? it says "v'Sarav."