Board Thread:Theories Discussion/@comment-13376834-20130430230244/@comment-23.122.217.39-20150809233305

Even if the doll was Eve it wouldn't be a demon of Sin, as Eve is not a demon.

They are also not "Sins". "Sin", as a solid concept in-canon, is a misinterpretation of the mechanics of how the demons work. They're incarnations of the Sin vessels. And even that is vague at best.