Board Thread:Theories and Speculation/@comment-29769110-20170115161829/@comment-734582-20170118091617

Lorenzo.r.1st wrote: see, I remember Tobi's explanation about the brain-release-chakra thing, but I never heard it from anybody cannon that the ability is just there, available for the user, even when they lose the first and only source of said power.. see what I mean? if u can find me anybody in the manga, or anime that says that, ill obviously believe u, but before then, I don't think so.. there isn't anyone in the manga who directly says this. However, Tobirama's explanation makes it clear that the source of the power is the brain, not the eyes. Sharingan is thus a manifestation of the brain's power. Since Madara used Susanoo without eyes, i think it's clear that Susanoo is thus a power of the brain, not the eyes.

Susanoo can thus be thought of as a separate Kekkei Genkai, but one that shares the same method of awakening as the Mangekyou. .