Board Thread:Naruto Discussions/@comment-11891028-20170719213849/@comment-1746153-20170720063717

I always assumed that the host's soul left the moment their body is taken over. I don't think it makes sense for two souls to stay in one body - if they did, I feel like the manga would have addressed it. So Madara just somehow "consumed" the sacrificial body, and it's pretty messed up.