Ok, time to get really crazy:
Let's imagine that souls in the Outside are ranked on a continuum of 1-10, where a 1-soul is effectively dormant and a 10-soul is an uber-Ciphrang or a God.
When someone is born in the World, a 1-soul is associated with their physical body. The soul doesn't *inhabit* the physical body. Rather it stays in the Outside and is linked to the physical body.
Over the course of a person's life, their soul grows, perhaps according to their sin. And when they die, the link is severed and their mature soul is adrift in the Outside to be consumed by the most powerful souls. As the soul is consumed, it regresses back to a 1-soul, at which point it's once against available to be associated with a newborn.
To put it another way, life on Earwa only exists to fatten up a soul to be consumed after death.
It might be that it's possible for some rare souls to exceed a threshhold, let's say, 7-soul, at which point, they become too strong to be consumed after death. These souls are powerful enough, in fact, that they become agents in the Outside -- Ciphrang.
With this kind of scheme, souls don't have the concept of life and death, rather, they belong entirely to the Outside.