Very good questions - thank you.

The Creator, both fundamentally and ultimately, is the One Soul. Each soul into which He incarnates is like a fragment, or piece, of this One Soul. These souls, or Logoi, just like the Creator, can incarnate further into more individuated souls, and so on and so forth. This process is very similar to how Russian Matryoshka Dolls work.

Groupsouls, or oversouls, are souls wherein the directly individuated souls that one Sub-Logos creates (and into which it both partially and fully manifests) spiritually evolve in such a way that each individuated soul returns to the experience and being of its direct "creator," or Logos. For example, if us humans were to evolve along this path, we would eventually coalesce and "return" to being Yahweh, or this planetary Logos. The groupsoul Yahweh, which would also be (and technically currently is) all of us would then continue to spiritually evolve with what would then be its peers - the other groupsouls of this solar system's planets - to eventually return to this solar system's Logos: the Sun. This process continues such that all of Us eventually returns to the Creator Himself. However, as the Creator is what everything and everyone is both fundamentally and ultimately, souls of any kind may take their own path to return to Him. The path we outlined here is simply and incomparably the most common.