one must understand who the all in all is. understand TITLES are not persons. scripture, 1 Corinthians 12:4-5 "Now there are diversities of gifts, but the same Spirit. And there are differences of administrations, but the same Lord. And there are diversities of operations, but it is the same God which worketh all in all". see it's WORKETH ALL IN ALL, not who is all in all.
example, 1 John 5:6-9 "This is he that came by water and blood, even Jesus Christ; not by water only, but by water and blood. And it is the Spirit that beareth witness, because the Spirit is truth. For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one". let's stop here for a minute. many have said, see this is proof that there are three. yes, three what? three TITLES of the same one PERSON who was diversified in flesh. how do we know this that these scriptures are speaking of titles and not persons? answer, the scriptures said "THESE" and not "THEY". They speak of person, but THESE don't. if the scriptures would have said, "THEY" three are one, then game over, close shop, and go home, it's settle. no, it didn't say that. and the proof continue in these next verses,
1 John 5:8 "And there are three that bear witness in earth, the spirit, and the water, and the blood: and these three agree in one. there's that these again. let's break these down. these three is ONE PERSON, the Christ, the MAN. how do we know this? watch to color match. man is a spirit that dwells in flesh. and our bodies is over 90% water/flesh hence the water, and we have blood. so the "THESE" three agree is a MAN who God came as. listen to the record, 1 John 5:6 "This is he that came by water and blood, even Jesus Christ; not by water only, but by water and blood. And it is the Spirit that beareth witness, because the Spirit is truth". QUESTION, is not the Lord Jesus the "TRUTH"/ yes, is not the Holy Spirit the comforter the Spirit of TRUTH? yes. same PERSON.