STS viable path toward Unity?

[Infinite Unity]

I am finding it challenging to reconcile how STS is an appropriate, viable path toward Unity, specifically throughout 4D and 5D (because at 6D, STS dissolves [in short]). 

It's fuzzy and I'm hoping some of you can help bring it into sharper focus.  

If Our (all of us beings, or parts) collective objective is to work toward Unity - toward the realization that we are all one and infinite manifestations of the Creator/Creation - how does STS serve this objective? 

I see STS as self-serving: part-serving or individual-serving. STS beings (or parts, facets) of Our One/Infinite Creator/Creation-ness place individuated self over unified Self. How does this stance bring the collective closer to unity? 

Such a STS being (part of Us) spends a long existence in the density of Love (4D), and then in the density of Light (5D) continuing to separate from (which seems to be a form of denial of) Our true nature, before finally reaching 6D and releasing STS stance. 

I can intellectually understand that there may be a STS being/facet that fancies itself as the benevolent leader over all of us others. That it alone must get its hands a little dirty, but for the greater good, so to speak: to reach Unity. Or, I know best what's best for Us. 

Yet, no veil beginning in 4D, so these STS parts/beings/facets of Us realize: in the beginning/end, We are One. There is no one dominant being, or facet of Us, so to speak. Whole is greater than the sum of its parts. 

How do these STS parts, facets of Us (or beings) reconcile that they are, indeed, moving us all toward Unity via separation (control, domination, manipulation, etc.)?

There is One being here. Much of what you believe to “right” or “wrong” has been taught or implanted into your mind. If I am the only One, there are no other opinions or inputs. There is no multi-level morality, as there is only One here. If the One is ok with something, then there are no others to question it, or say an opinion on the matter.
So negativity can begin to be a reinforcer and beautifier of Love/Light. Also Divine is stating that all things are a product of another product all the way to the source.