Everything has a soul, even nonlife. The soul is defined around the "animating force". Its immortal, everywhere and nowhere, all around and yet unseen. That's energy. Descibed before anyone truely knew it was there. Religion worked because it described the essense of what people felt, even with the wild stories.
Prove, say it without proof is only magical thinking.
The soul/spirit is created then, giving individual "expression" to the overall process. Humans having the burden of feeling/knowing that they are connected, and trying to express it.
Prove again, more magical thinking.
The individual consciousness continues, as long as the lifeforce flows.
The body would be in a state of energy decline. Ther may be an energy drain.
If an immortal soul does exist, I’d say it was logical that there must be rules about when it can come and when it can go.
Saying anything you what without prove, is story telling and/or magical thinking.
It would want to, but it can't, so it would have to adapt to the new situation. I think dreams will help out of body spirits function, whether they were designed to or not.
You havn't shown the need for a soul, this only shows that you have lack of understanding of how things work, and so you put the universe in terms you understand, not how they are.