The Watchtower points out that Michael is the only Archangel mentioned in the bible; therefore he must be the highest Angel. The parallel of Michael, as the highest angel and Jesus as God's first creation, seems at first to imply that they could be the same. A little background into Jewish thought during the first century will show that this is not necessarily true.
The Word "Archangel" can be compared to a similar word in the NT, "Chief Priests"
A Greek Lexicon of the New Testament and Other Early Christian Literature
'archiereus' The pl. is used in the NT and in Joseph to denote members of the Sanhedrin who belonged to high priestly families.
'archaggelos' A member of the higher ranks in the heavenly host PK 2 p. 14,27. Michael (En. 20, 5;8) is one of them Jd 9. He is also prob. the archangel who will appear at the Last Judgment 1 Th 4:16.
The Chief Priests are mentioned several times in the NT. It is clear that although there was a Chief Priest over the others, there are many references to the others as Chief Priests. Therefore when someone is referred to as a Chief Priest, it does not necessary mean he is Head of the Priests. The word archangel was used in a similar fashion during that period, as can be seen in the book of Daniel and the some of the writings that did not make it into the bible.
The book 1 Enoch is the best example of this.
I Enoch 20:11. And these are names of the holy angels who watch: 2. Suruel, one of the holy angels-for (he is) of eternity and of trembling. 3. Raphael, one of the holy angels, for (he is) of the spirits of man. 4. Raguel, one of the holy angels who take vengeance for the world and for the luminaries. 5. Michael, one of the holy angels, for (he is) obedient in his benovolence over the people and the nations. 6. Saraqael, one of the holy angels who are (set) over the spirits of mankind who sin in the spirit. 7. Gabriel on of the holy angels who oversee the garden of Eden, and the serpents, and the cherubim.
Most scholars agree that 1 Enoch was composed between the 2nd Cent. BC - 1st Cent. AD. They also believe that the book of Daniel, received its final editing in the 2nd Cent. BC. Both the book of Daniel and the book of Enoch are apocalyptic works, and share many of the same ideas of that period. In the book of Daniel, Michael is referred to as "one of the foremost princes", not as the foremost prince (Da 10:13). This context is much like 1 Enoch, which lists him as just one of many "holy angels". The other reference in Daniel (Da 12:1), "Michael will stand up, the great prince who is standing in behalf of the sons of your people". Again, very much like Michael in 1 Enoch.
1 Enoch also heavily influenced the book of Jude. The idea of the angels of the flood being held in eternal bonds (Jude 6) is discussed in 1 Enoch 10 1:22. The reference to "Michael" (Jude 9), and the reference to Enoch's prophesy of the myriads of angels (Jude 14), are clear indications of 1 Enoch's influence.
Jude 14
Yes, the seventh one [in line] from Adam, Enoch, prophesied also regarding them. When he said: "Look! Jehovah came with his holy myriads.
The Deuterocanonical book of 2 Esdras also refers to the archangel Uriel.
2Esdr 4:36 And unto these things Uriel the archangel gave them answer, and said, Even when the number of seeds is filled in you: for he hath weighed the world in the balance.
It is clear from the documents of the 1st Century period that Michael was not considered the only “archangel”. He likely became a favorite of the Christian writers because he was, “the great prince who is standing in behalf of the sons of your people”. I see no evidence of a connection between Michael and Jesus.
The Watchtower has come to this conclusion for the same reason that Russell believed the pyramid was God's Witness in stone. The Watchtower has continually looked for patterns in the Bible, and drawn false conclusions from them. This explains all of the false prophecies and all the strange doctrines that they now have, and all the weird things to come.
If you look at any complex subject, such as the bible, eventually you will come up with interesting parallels. Throw in a complex structure like the pyramid and you will get Volume III of Studies in the Scriptures.
This is just another example of the Watchtower’s narrow-minded point of view, and their attempt to be slightly different than other religions, for the sake of impressing those without some background on the subject.