Board Thread:General Discussion/@comment-26830922-20170211043007/@comment-26830922-20170212224125

While Masaki and Katagiri never drank Yhwach's blood, they were still descended from Quincies (who were created by Yhwach) and thus they still had his blood in them (which is why he was able to take their powers). The scan specified that no matter who died in the Vandenreich's battle, their souls would go to Yhwach as he spread pieces of it during the first battle. Yhwach's backstory confirmed that he could give away actual portions of his soul that eventually returned to him. If Haschwalth was talking about the quincies, he would have said just that rather than "pieces of Yhwach's soul."