The individually of the soul surely has something to do with the individuality of the body, What can we know of the soul, except by the body. The mind and body looking inward find the soul, which is to say. that which already lives in eternity.
In death we recognize that we really are just soul as the body disappears.
The soul is only individual at the lower levels. As it increases in operation it expands to the point where one realizes that we are all one. What you do to your brother you are actually doing to yourself.
It is not the mind and body that look inward, it is consciousness. Consciousness is a function of the soul, not the body. It manifests the body at conception and departs at death. Without it there is no life energy to have cell division nor DNA transcription.
You can have consciousness without a physical body but you can’t have a body without consciousness.