I understand the connection you’re making between Michael and Jesus, but I don’t see that conclusion as necessary from the text.
Even if we say Michael is an archangel...a chief angel...that still places him within the created order. But when Jesus speaks in Bible, He describes a relationship and glory that go beyond that.
For example, when Jesus Christ says, “glorify Me in Your presence with the glory I had with You before the world existed” (John 17:5), that points to a shared, eternal glory with the Father.....not simply the status of a high-ranking angel.
So if Michael were the only archangel and also became Jesus, that would mean a created being later shares in the eternal glory of God Himself. That seems to blur the distinction Scripture consistently makes between God and His creation.
Also, Scripture never directly states that Michael is Jesus, it treats them distinctly. Michael is described as one of the chief princes (Daniel 10:13), while Jesus is presented as uniquely the Son.
So to me, it’s a leap to move from “chief angel” to “the eternal Son of God,” especially when the descriptions of Jesus go beyond anything said about angels.