Jesus is reported to have sent his angel on occasion ... perhaps the reason there seems to be a connection between Michael and Jesus is that Michael is a personal messenger of Jesus ... his angel.
Also ... is Jesus ever referred to as "Son of God" in his prehuman existence? We know he is referred to as "The Word", but doesn't "Son" apply exclusively to his condition after being born from man ... which would technically make him at that point both "Son of Man" and "Son of God"?
Couldn't Jesus being the "only-begotten Son of God" refer to this one and only man's unique and miraculous birth ... the only-begotten from God but born from the womb of a human?