As to Michael being Jesus.
names in the bible seem to have a functional quality at times
as Jesus means domino's delivers or er, YHWH saves... it is a name which shows his function.
Immanuel means God is with us [for a change]
and Micha-el mean who is like El? or God.
to me it seems clear that no bible writer thought that Jesus and michael were the same guy
But there are some striking parallels such as Daniel's description of Prince Michael standing up [often used for taking kingship] and Jesus nearly quoting this word for word as referring to himself.
and Jesus never being mentioned with michael sort of like superman and clark kent, while attributes are often seemingly interchangeable
like Jesus coming with the call of the archangel.