Remember that Jesus didn't begin as flesh, but he became flesh (jn 1.14). People may have the wrong notion that he began as flesh.
Also the idea would accord with passages where God talks to himself, where the son would talk to the father and the father would talk to the son as if they were more than one:
Father, glorify your name.” Then a voice came from heaven: “I have glorified it, and I will glorify it again.” John 12:28
Make the heart of this people dull, and their ears heavy, and blind their eyes; lest they see with their eyes, and hear with their ears, and understand with their hearts, and turn and be healed.” Then I said, “How long, O Lord?” And he said: “Until cities lie waste without inhabitant, and houses without people, and the land is a desolate waste, Isaiah 6:10-11
and the Holy Spirit descended on him in bodily form, like a dove; and a voice came from heaven, “You are my beloved Son; with you I am well pleased.” Luke 3:22
Why does God talk to himself? I highly doubt he talks to himself for his own sake, but for our sake. (compare: "For whatever was written in former days was written for our instruction, that through endurance and through the encouragement of the Scriptures we might have hope." Romans 15:4
Jesus lifted up his eyes and said, “Father, I thank you that you have heard me. I knew that you always hear me, but I said this on account of the people standing around, that they may believe that you sent me.” John 11:41-42 )