Dear, thanks for your questions.
The various questions above are somewhat related, but I propose to still treat the differently here below in separate responses. Of course I cannot or do not want to give a simple or straight final answer to such questions, as the goal is that we are building an imagination in our mind and soul, of the topics we are exchanging on, based on the picture sketches that come from descriptions. Descriptions from lecture references that I suggest to pass on; as well as contextual narrative and glue that I want to add to connect and integrate them.
So first: let's call Question A: regarding the link between the bodies 'below' and spirits 'above'.
1/ This is purely a spiritual linkeage, one should not think in physical material terms or concepts. One has to let go of space and time as we experience it on Earth with mineral matter on the physical plane.
My suggestion is that, to try and imagine, you start with reading how already on Old Moon, there was this connection that was described. I am referring to Schema FMC00.181 on Group souls of humanity that sketches this spiritual connection that is described in a.o.
Group souls of humanity#1909-06-26-GA112
Group souls of humanity#1909-06-27-GA112
Also when thinking of beings on other planets, please don't think in terms of the mineral physical planets (and so that they would be 'far') but of the planetary spheres. These can be imagined like russian dolls, embedded into one another, or intertwined. So for example imagine the Earth embedded in the sphere of the Moon's orbit, as well as the Sun sphere.
More on general terms, it's important also to build a picture of what is meant with these group souls, and Jehovah, as it is the start of the process of individuation of Man through the Development of the I. Just like the animals have a group soul on the astral plane, one can imagine this as the start for the process of human individuation. Imagine a cake that crumbles into pieces, ever smaller. You can link to this the class of beings called Jehovah, but also the different human races and folk souls, etc.
For a general broader picture, there is a narrative here with links to other lecture extracts.
[[Development of the I#[1] - Narrative to the Development of the Human I]]
2/ Also, when you try to imagine this important milestone of the descent, the following two extracts can bring to life Schema FMC00.443 on Development of the I
Lemurian epoch#1906-11-26-GA283
Development of the I#1908-02-29-GA102
Of course what happened was quite a bit more complex, as a variety of schemas further illustrate, eg Schema FMC00.472A or Schema FMC00.457 and so on. But this would carry us too far for now.
Hope this addresses the first part of your question. We can go further into it if you want.