One early response was that Jesus may have been an angel from heaven. After all, the Son of Man is a celestial figure who comes on the clouds of heaven surrounded by angels. The Greek text of Isaiah 9:6 describes the Messiah as "the angel of great counsel." Perhaps Jesus was himself a powerful angel, or even an archangel. Traces of this christology can be found in a first- or second-century Christian book named The Shepherd of Hermas. One passage, Sim. 8.3., virtually identifies Jesus with Michael the archangel.
http://www.auburn.edu/~allenkc/openhse/trinity1.html#Angel
the idea that Jesus and Micha-el were the same is not new nor exclusive to JWs.... 7th day Adventists, where likely, JWs got the idea from, hold that Jesus is both God and Michael
The bible is full of odd sayings indicating that Jesus had some form of existance prior to being made a human, that he emptied himself of that form which was in the form of God [spirit like the angels].
even if you believe in the three headed monster called the trinity, it is not unlikely that each head had its own name as they are all call persons....
many Identify the Angel of YHWH --who was the head of the army of God, with Jesus' pre-human existance as well...showing that the term Angel is not out of the question
in Daniel it says Michael will stand up [often used of kings taking power]... and In matthew 24 Jesus essentially quotes this very passage
and applies it to his taking kingdom powers.