Some say The Son of Man only existed in the mind of God as foreknowledge before He was made flesh. Faith is substance. Even if all that existed of Jesus before His birth (and I don't believe that given what is in Daniel) was foreknowledge of Him then still that knowledge was as certain as faith can ever be. As such even then it was substance - real existence having real effects not just in God's mind because God had made Him known to a chosen few, including angels and prophets. Yet that is not enough to explain conversations between the Son of Man and the Father and between the Son of Man and archangels. Those happened centuries before He came. So you would have to say they were conversing with foreknowledge - which is conceivable but pushing it because it would then be a bit of a false impression Psalmist and Daniel and Enoch were giving - leading us to believe He actually existed not just as foreknowledge. Yet there is a mystery in this that foreknowledge with certain faith is indeed existence in its own right that transcends space and time and matter and energy in such a way it hints at what God is like - in one aspect, and the Son of Man before He came, and the Holy Spirit. So to sum it up as The Word, the Logos, makes more sense considering this. After all whatever the Son of Man is over time from before time, it had to survive the chaos of creation - big bang or whatever - so could not itself be matter as we know it.
