Great finds. The Angel of the Lord is Christ (I believe). Add to your list the scriptures about Melchizedek, which is from the NT but about an event in the OT:
Heb.7:1 For this Melchisedec, king of Salem, priest of the Most High God, who met Abraham returning from the slaughter of the kings, and blessed him;
2.To whom also Abraham gave a tenth part of all; first being by interpretation king of righteousness, and after that also king of Salem,, which is, King of peace;
3.Without father, without mother, without descent, having neither beginning of days, nor end of life; but made like unto the Son of God, abiding a priest continually.
Christ was not walking the earth before Incarnation. To imply otherwise is blasphemy and heresy. It was taught by Gnostics and we see the same pitfall repeat itself with every generation.
Hebrews has actually created a confusion with verse 7:3 with regard to his lineage. Guys, this is not new stuff! Obviously Christ has a Mother.
The similarity between him and Christ is that both were priests without "descent" (not being of the Levi line). The word Son of God was a title given to any anointed person (kings, prophets, angels, etc.)
Yes, the more I read the more I agree that the Angel of the Lord is Christ. And that's a great addition regarding Melchizedek. Thanks Ping. :)