The Bible clearly refutes the idea of Jesus being Michael or any other angel:
Hebrews 1:5 - God has never said to any of the angels, "You are my Son, because today I have become your Father!" Neither has God said to any of them, "I will be his Father, and he will be my Son!"
Hebrews 1:13 - God never said to any of the angels, "Sit at my right side until I make your enemies into a footstool for you!"
God never said these things to any of the angels, but he did say them to Jesus. (Ps 2:7; Heb 5:5; Ps 110:1; Mt 22:42-44) It follows that, scripturally, Jesus cannot be an angel.
The fact is that Jehovah's Witnesses enjoy the pretense of believing/accepting the bible but it's all just part of the act. JWs follow the Watchtower - not the Bible. In fact, they are more followers of men than any religionists I have ever met. The nature/identify of Jesus is just another example. The fact that Hebrews chapter one COMPLETELY PRECLUDES the possibility that Jesus is an angel is irrelevant to them because they DON'T BELIEVE THE BIBLE. They will continue to believe that Jesus is an angel UNTIL THEIR WATCHTOWER CULT LEADERS TELL THEM OTHERWISE. Only then will they accept Hebrews chapter 1.
Peace.