I just quoted the verse........"became flesh, and dwelt among us".. so, that verse is not talking about anyone except the pre-incarnate word of God.
Also....... the Preincarnate Word.......became a virgin born man........the suffering Messiah, who became poor so that we could become RICH... and he offered his human body and blood for our salvation, and when He walked out of the Tomb, His body was eternal......same as we are going to get a "new body"....and Once He was Risen, His '"suffering messiah" period had ended, and now He's the one with "given all power in heaven and on earth'.
So, He did change.......a lot......for example...........when we read....>>"Jesus the same, yesterday, today, and forever".......we need to realize that when He was the pre-incarnate Word, He didnt have a name, except for "I am".
Christ became the name JESUS< after he became a HUMAN.....>He didnt have this name in Heaven, before He came down here.
See, this is another CHANGE.