Hebrews 1-2 establish Christ's superiority over angels, but notably do not mention the Angel of the Lord. Instead, the author handles the Angel differently.
Christ's return marks the beginning of the end of mankind's problems. However, His return will not be the final end, which comes when God is all in all.
The identical actions of the Lord and the Angel of the Lord show they are the same Being. The God known by Abraham, Isaac, Jacob, and Moses was Jesus Christ.
Husbands need to imitate God's behavior as reflected through the life of Jesus Christ. Isaiah 54 reveals Yahweh (who became Jesus Christ) as the Husband of Israel.