Sorry, English is not my native language, I didn’t meant to say that you were, I understood you were talking about repressed parts of your consciousness.
I very much am not alone inside despite having broken down multiple barriers, but I can absolutely identify with the experience of fetching part of the self from the confine of the abyss of the mind and integrating into the present along with all memories of that part.
and that ability that you’re talking abou, of merging parts of the self into the whole, is extremely useful, whether for a singlet or for a system.
I was only speaking on that and it’s usefulness from my perspective, I wasn’t assuming anything about you, sorry for the misunderstanding

and yes, reintegrating “lost” parts, the shadows hidden inside, does allow for some deep work and reconciliation, ultimately bringing enhanced wisdom, and a richer experience of life. More complete.
my experience is that whatever we might have thrown in the depth of the abyss of the mind, swept under the rug, always come crawling back, stronger, bigger, and thirstier than ever.
until we can acknowledge it, “see it from the perspective of the part”, understanding why this part of us came into being, what might have produced it, for what purpose, and whether this purpose is still useful to this day. getting this part of the self that was lost to understand that we are no longer in danger of death or other terrible stuff today and so its protection is no longer useful, or things of the kind.
Though as you said it’s not only bad stuff that are swept under the rugs.
when the mind build barriers in urgency, it might wall off parts of the self that are useful, constructive, what one might call “good memories”.
Though I have memories since I was 2 years old, there are still huge chunks of my life missing from my memories, and this is after some deep work since our whole childhood was walled off at one point.
And since as you explain we can use it to integrate parts of the self, skills, memories, that may be fragmented, “lost”, ignored, walled of, etc. that makes it an extremely useful title 
thank you again for telling us about it and sorry for the misunderstanding 