Chapter 646 has created a lot of confusion about the origin and nature of chakra. According to Madara, the chakra of every living shinobi belongs explicitly to the Shinju. Yet how can that be? From the beginning of the series, we've been told that chakra is created when an individual mixes his own spiritual and physical energies together. How can these two seemingly contradictory statements be reconciled?
My theory is that the Shinju's chakra is present in every single shinobi as the Keirakukei, or the Chakra Pathway System. When Kaguya ate the Fruit, the Shinju's chakra took the form of the Keirakukei within her body, allowing her own physical and spiritual energies to mix together. If this is the case, in a real sense, human chakra does belong to the Shinju, as it's existence is utterly dependent on the the power of the God Tree.
This would also fit with the fact that the Shinju seems to be inspired by legends of the World Tree in various religions. In mythology, the World Tree acted as a link or bridge between heaven and earth, or the physical and spiritual realms respectively. So it would be fitting if it's power would act as the bridge between the physical and spiritual aspects of human beings.
My theory is that the Shinju's chakra is present in every single shinobi as the Keirakukei, or the Chakra Pathway System. When Kaguya ate the Fruit, the Shinju's chakra took the form of the Keirakukei within her body, allowing her own physical and spiritual energies to mix together. If this is the case, in a real sense, human chakra does belong to the Shinju, as it's existence is utterly dependent on the the power of the God Tree.
This would also fit with the fact that the Shinju seems to be inspired by legends of the World Tree in various religions. In mythology, the World Tree acted as a link or bridge between heaven and earth, or the physical and spiritual realms respectively. So it would be fitting if it's power would act as the bridge between the physical and spiritual aspects of human beings.