It is presumptuous to make claims that cannot be clearly supported in the scriptures. That is a given.
Using role play I assumed the position of one who believes that Jesus and Michael the Archangel are one in the same person, just in different roles. My conclusions:
The multiple chief princes are roles in relation to the appointment of certain angels to the oversight of certain nations of this earth as in the chief prince of Persia. A chief or arch prince is and entirely different thing than is an archangel. There is only one appointed head over all of the angels.
In relation to God's people, God gave them the highest ranking angel, the chief of all the angels (the one and only archangel) as their princely overseer. (It should be noted here that non-Biblical sources which reference more than one archangel (more than one chief over the angels) are of pagan origin or influenced heavily of pagan concepts and it is an egregious sin to adulterate their content into our holy scriptures even by way of oral speculation. Lastly, Satan appointed himself as such an archangel in defiance of God but in our holy scriptures Satan clearly remains subordinate to Michael, whom our holy scriptures identify as the chief over all angels.)
Is Jesus one and the same person as Michael the Archangel? The most direct evidence in our holy scriptures which points to the answer being yes, is found in the design of mankind in the image of the heavenly.
Adam was the son of God in the physical realm, in image of the son of God in the heavenly realm.
The first born son of God, both the one in the heavenly realm and the one in the physical realm, was created in the perfect image of God. ( And it is absurdity to argue the meaning of the word, "born". Leave that for the ignorant to debate that they may think themselves intelligent. "Born", is a word of broad utility.)
In the image of God, Adam would be that image of God to all who were born or made or procreated through him, even as Jesus is declared to be the image of God over all who are born or made or procreated through him. God the Father is always the creator and the sons can do no more than procreate using the power supplied them of the Father. The word "father" is like the word "create" in the ancient Biblical texts in that just as there was no specific word for "grandfather" neither is there a specific word for "procreate". These are simple enough for us to figure out apart from having specific words for them. And in the Greek, "en", meaning "in", and the preposition "dia", meaning "through", demands the understanding that Jesus was and is the one that all things were procreated "through", while his Father is the creator of all things "in" Jesus. Now enliven your brains to ponder that:
Speaking of the Son: Colossians 1:16 "For en him were all things created, that are in heaven, and that are in earth, visible and invisible, whether they be thrones, or dominions, or principalities, or powers: all things were created dia him, and for him.."
And here we see that stated more directly: Ephesians 3:9 "And to make all men see what is the fellowship of the mystery, which from the beginning of the world hath been hid in God, who created all things dia<(through) Jesus Christ.."
As to this earth and man, it can be said that it was God who created the rest of us in and through Adam. And that is the image of what took place in heaven.
How does that support that Jesus and Michael the Archangel are likely one and the same person? The angels are God's heavenly family and Michael is their head evidently in and through whom they were procreated, even as Adam was created in the image of heavenly things, our head, in and through whom we were procreated.
The expression "procreate" does not have to be confined to physical sex like so many pea brains seem to think. "Procreate" infers God doing the creating in and through.
Sticking to the holy scriptures so as to be secure in the reliability of the information as bearing God's seal, that is the closest anyone can come for now to a precise answer.
My conclusion is that I agree with Jehovah's Witnesses that Jesus and Michael the Archangel are one and the same person.