We carry multiple Beings in our Souls because we carry each other and the world. The archetypes are all of us, all the myriad types and styles of Beings that compose our world, human and non-human. We really are the world and the world is us. The idea that we must integrate into a central and strictly human Self seems to be a desire to retain the Western sense of individuality and Ego, and the attitude of superiority of human over non-human.
The sense of individuality we possess makes us susceptible to denying the sense of self to non-human beings:
For individuals in industrialized society, the sense of self is felt to be and understood to exist within the confines of that person. Further, the only beings that are assumed to possess this sort of subjectivity are humans; other beings, lacking this subjectivity, become an other and as such, are of lesser value. Moreover, any point of view which does understand nonhuman beings as possessing an individual self charged with spirit, soul and intelligence is dismissively accused of animism or of anthropomorphizing the outer world. Animism is defined by Freud as nothing but the projection of primitive man’s emotional impulses. As a result of that sweeping assumption, the whole of the highly complex, sensuous and intelligent natural world is reduced to mindless things, blank screens. But by declaring ourselves the only beings with intelligence and a sense of self, we have, in many ways, placed ourselves in a vulnerable position (Rocky Greene, What does the Individuation Process have to do with the Earth?).