Board Thread:Chapter Discourse/@comment-44056425-20191203182120/@comment-36009152-20191220220847

With Yu, think bodies are needed, like if something awful happened the present day Yu, that's it, there are no Yu dummies (to state what they may be) to transfer his consciousness over if it is that. Shikama Doji may be the only one with the knowledge, so in a weird way it's good he is sealed to help Yu in case anything happens - and can see that happening what with bitter foes often having to ally together out of a practical means to survive.

Noya may very well spill that secret, he knows about Yu from the past and it's clear he's seeing a grown Yu, meaning that none of the past Yu's likely were around that long to grow : ( also so the present Yu is possibly the only successful experiment for whatever purpose was in mind, for whoever is pulling these strings.