Looking like someone and bringing them up doesn't mean you're now their descendant... Reincarnation works in the sense, you're good and in your next life you get a better life than before. You might remember a past life but that doesn't mean you look like them and bring them up means you are them. If that is the case then Patton actually was Napoleon...
There is a particular question I havent been able to answer for myself - in wh40k setting the Warp is literally filled with daemons, i.e. its substance, every corner of this dimension, every region or place, is filled with daemons. And yet, somehow, new sentient beings - humans, Eldar and everyone else having a soul - continue to be born in vast quantities - how is it possible? A soul is born from the Warp, is made of its energies - sequently, if the Warp is full of daemons then new souls are either supposed to be devoured immediately or be corrputed even before inhabiting a physical body. So the question is where do the new souls continue to be born from and inhabit physical bodies of sentient races?
Being born after they die is a pretty important part, for obvious reasons. That was the pont and is how reincarnation works.
