The doctrine in itself was always erroneous and counter Scripture.
He, John, heard twelve tribes named and their number: Israel as counted by God.
After that he sees: a huge crowd of people from all nations and tribes and languages and dialects that he (and no man) was able to count.
They are the same. They are (in) the Holy of the Temple, ΕΝ ΤΟ ΝΑΟΣ, in the dwelling of God, regarded like Israel, by appearance from all the tribes (!) and all nations.
Messiah is Ό ΕΡΧΟΜΕΝΟΣ, the Coming One. He will be with our humankind as the Son of Man.
We who shall be with him will be like trees planted along streams of water giving leaves that wither not for healing to the nations, for freedom of creation to be children of God.
The number is the ΠΛΕΡΟΜΑ pleroma a man named Paul (Shaŭl) was hinting at in one of his letters, and a Shimon (Petros) might have been estimating at when he addressed Jerusalem to return so that the Heavens would return her Messiah who they had cut off from the Land (that was his own) and then He would restore its wealth and its beauty and its life anew.