You don't think it's sillier that there are a finite number of souls that float around nowhere waiting for sperm to hit an egg before being reassigned? I do, I think it's completely absurd. Life does have a purpose, it's just that the purpose is guided by our genes, rather than anything under our control.

Of course it's both possible and impossible, but that's a million miles away from being likely, and comes from the human desire to be special or separate from nature.

If this theory was put forward for giraffes, but not humans, people would think it's crazy. When mystical pseudo-science tries to interject itself with scientific hypotheses, then you get a mish-mash of blurred thinking, and that's all these scenarios provide. It's just not logical.