The messenger of Yahweh in Zechariah 1:12 doesn't know all things and this would have been before he emptied himself as in your false doctrine about God becoming a man, so why didn't Yahweh the second person of your trinity know all things in the OT?yes :
Note the Hebrew word for angel is also translated as messenger
The Messenger of Yahweh is God.
Exodus 3 and on
Genesis 22:10 and on
Gen 28:13 > Genesis 31:13
Judges 13 :8 -23 goes to Isaiah 9:6
The Messenger of Yahweh is distinct from God
Zechariah 3 to Hebrews 7: 25 and 1 John 2:1
1 Timothy 1:16 + John 1:18 Isaiah 6:1> John 12:41
The Messenger of Yahweh Jesus Christ
John 1:18>Isaiah 6:1> John 12:41
Not Matthew 1:20 nor Acts 12:7
Revelation 22:8-9 and Exodus 3:5 and Joshua 5:15
That is the big problem for your theory on this above dude.