I know and understand why JW do not teach the trinity even though I do not believe in the supernatural. The same way I would understand why Michael is Jesus if there was an argument for it anywhere in the bible.
I think a problem arose when rejecting the trinity. If Jesus is the superior son of God, where is he mentioned in the OT? someone that special should be mentioned by God. And it came down to trying to connect Jesus to Michael, based on 2 words "prince" and "arch." I just don't by it.
the identity of the Messiah was never revealed in the scriptures....it was only given in clues
the first clue that God would even send someone to correct the mistake of Eden is found in Genesis 3 where God says to the serpent that a seed of the women would come and bruise him in the head. That prophecy was understood to mean that an offspring would be born....and when Eve gave birth to her first child Cain, she said
"God has produced a Seed, perhaps this one will bring us rest from our labor" So the hebrews always expected a child to be born who would relieve mankind of the burden of sin.
But no one knew the identity of who it would be because God never revealed that. He only gave them clues....
He would be born through Abrahams offspring, Gen 22:16-18
he would come from the tribe of Judah, Gen 49:10
He would be born in family line of King David
He would be born in the city of Bethleham
Clues were given, but it wasnt until he actually arrived that people would be able to identify who he was. And from that time forward, his disciples were able to understand who he was and where he came from. Hence they knew that he had a pre-human life...he was the son of God, he was the 'only begotten of God, he is the head of the angelic hosts etc etc etc.