User blog comment:B214/Question and Answers 4/@comment-24412159-20150304161506/@comment-25032153-20150304165135

we dont know if they can just revive a soul without te body but we knowthat the evil pieces can connect with a soul with volume 12 we see that the piece are linked to the soul. but if they ask to use the holy grail to both make the body and fine the soul for Akeno mother so that they could revive her with the help of evil pieces.