Simply because you do not have the answer.
The answer is not mine for me to have, but rather to share for understanding, to all who ARE born again of the Holy Spirit. John 3:3-8.
For us, Jesus Himself is the
New heaven, wherein God the Father dwells. Mat. 3:16.
By repentance towards God through faith in Jesus, we then are to ask/invite Him into our life, and then receive Him as our Lord and Savior. Luke 11:13; Rev.3:20.
In so doing, He then literally comes into our "earthen bodies", bringing the Father within Himself, of which together,
they are the "
another Comforter", the Gift of the Holy Spirit. John 14:16, 23, 26, 15:26, 16:7.
In that moment, we are to
THEM the
New Earth of their permanent indwelling, called
"the New man" of Christ dwelling
within our
"earthen vessels" [bodies], which is "Christ in us", aka
collectively, the body of Christ. 2 Cor. 4:7, 5:17
Through Christ in us,
we are the New earth of God's indwelling.
Quite literally and spiritually, since Pentecost, God has been "building and making" from out of His chosen
"Earthen vessels",
His New City of people, whose "
foundations" are Christ and the 12 Apostles.
Rev. 21:14.
They did, at Pentecost. As it is written...if you receive it:
Rev 11:3-4
(3) And I will give power unto my two witnesses, and they shall prophesy a thousand two hundred and threescore days, clothed in sackcloth.
(4) These are the two olive trees, and the two candlesticks standing before the God of the earth.
Act 1:7-8
(7) And he said unto them, It is not for you to know the times or the seasons, which the Father hath put in his own power.
(8) But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth.
That is correct. For all we who are born
AGAIN of His Spirit, by His presence within us, we are His witnesses.
However
none of us were ever physically born having the Holy Spirit upon birth,
EXCEPT John the Baptist and Jesus.
The church (Elect) are God's Two Witnesses. Not Jesus and John. Not Moses and Elijah. Not two individuals. But God's witnesses.
John was
the witness to the world
of who Jesus is: "The Lamb of God, who taketh away the sin of the world".
As for Jesus, he is
the only witness to the world
of who God the Father is. "I and my Father are one".
And your point is? What does this have to do with the ministry of "Two Witnesses" on this cursed Earth before Christ's return and New Earth and New Heaven.
There is no future ministry of any other
two witnesses to come. John and Jesus were the only
two Anointed witnesses, who came as a
joint ministry to give witness of the KoG
, as only Jesus knows personally of how it truly is!!
We ourselves who are IN Jesus, and He IN us,
are the New city of God.
Jesus is the literal
New Heaven of our dwelling place, and we of our "earthen bodies" are the
New Earth of God's dwelling place.
We each are the "mansions" in "His Father's house", who is Jesus Himself. John 14:3
Edit: let us not forget that
God the Father is a Spirit ONLY, but now, for the first time and forever, He has
enjoined Himself within the Immortal flesh and Eternal Spirit of His only begotten Son Jesus, so that through Him, the Holy Spirit of God the Father can now also dwell within us,
thereby "making" us to be HIS New creation, His NEW EARTH. 2 Cor. 5:17.
Now, as I have previously recommended for yourself, do read, study and digest
by the mind of Christ within you, all the Gospel
details about John and Jesus, especially what each have to say about each other's "coming", revealing to us of them being the only Two anointed witnesses of Zech. 14, Rev. 11:3-4,
who came "
before the coming of the great and dreadful Day of the
LORD". Malachi 4:5