Board Thread:Fanon Canon 2/@comment-2089817-20140922021242/@comment-2089817-20140922054215

The soul is the source of consciousness. It has nothing to do with chakra. However, it is because of chakra that Hagoromo could so freely move about. Kaguya had limited mobility due to having, more than likely, very little chakra as a soul. Just enough to allow for that one-time intervention which allowed her to interfere with Hamura, which can be considered a plausible story.