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The Origin isn't a part of the Soul. It has never been explictly stated, but if anything, it is a part of the body, soemthing along a natural "Instinct", as per:the origin is basically the invariable part of the soul that stays with every reincarnation so it's not like there's no link. Specifically, Touko theorized that Lio was a predator in his past lives due to his origin and that, when he awakened it, they all kind of fused together to become a "herd"'
and by the part in Kara no Kyoukai in which Ryougi Shiki's "birth" is explained/the Void personality being the personality of the Body. The body is the first factor of humans. The soul is the thing that defines something as a Life, and as above, stones can also have origins.The direction of everything that arose from fundamental cause. The α that enabled the existence of α, the absolute order that existed at the very core.
For instance, something with the Origin of "taboo", regardless of being born as a human, animal, or plant, would always exist to go against the morals established by the collective.
It was the idea that, independent of the process of reincarnation, humans acquired bodies and wisdom from the directional force at the point of origin, and acquired personalities that were only slightly different from their prior lives.
Individuals who awakened their Origins would be consumed. This was due to "personality" being something merely on the magnitude of one hundred years; it would be overwritten by the directional force born from the origin. However, humans (human bodies) who were overwritten by their Origins would acquire great powers.
Araya Souren learned the technique to awaken Origins during his research into the root of humanity.
Of course, he only awakened the Origin of one person.
If you define Lio as the "person" derived from a "to eat" origin, it's not that he was a predator in his previous form, however that may have been - He cannot be anything but something that will tend to "predation". The same way that Kiritsugu can't fix thing without in some way making them obviously "wrong", because Severing and Binding.