Angels also manifested themselves in human body form. The preincarnate Word may have manifested in himself in the appearance of a body, but he did not have a body as part of his nature BECAUSE if he did, then there is no need for the incarnation by virgin birth. If he already had a body nature then all he had to do is appear rather than be born. His preincarnate appearances were theophanies just as angels appeared in bodily forms.
Was Jacob wrong when he said I have seen God face to face, calling the place Peniel ( Gen 32:30) ?
Another example is Gen 31:13.
The Angel declare " I am God of Bethel"
Can any angel call himself < God> ?
Do you know that there are 2 kinds of angels in the Bible, Malack and Elohim?
Malack showed up many times in OT. He was met by Manoah couple as well (JUdge 13:18).
He wrestled with Jacob ( Gen 32:24) and ate the meal provided by Abraham ( Gen 18:1-)
The reason why He came thru Mary was because He had to take over the nature of the descendants of Abraham, in order to rescue the Adam's race.
He couldn't take the Cross if He remained as the Angel.
But by coming into the human world, born in the manger, He had to pass thru all the troubles as a Son of Man, then went to Golgotha.