This octave logos/density structure is due to the divergent STS-STO polarities, not despite it. There would be no 6th density unity without it. So to ask if STS is a viable path to unity is a misunderstanding of what is being unified (no STS, nothing to unify). We would not even have an octave based density system because it would not be required.
As to its role, the basic answer is catalyst, it creates a more elaborate expression or experience for the creation. You can just look at it from a purely mathematical point of view.
Now what we may be witnessing is the functional limit of such a system, if STS was allowed in a higher ratio, the octave could become unstable and without resolution for unity, and simply dissolve. I believe this is part of the spiritual war in this logos. But that's a much different topic.
As to its role, the basic answer is catalyst, it creates a more elaborate expression or experience for the creation. You can just look at it from a purely mathematical point of view.
Now what we may be witnessing is the functional limit of such a system, if STS was allowed in a higher ratio, the octave could become unstable and without resolution for unity, and simply dissolve. I believe this is part of the spiritual war in this logos. But that's a much different topic.