User blog comment:Calvincambridge30/Versus/@comment-3481504-20151019145014/@comment-213.152.161.181-20151019153927

Crowley said to Cas that his position is not that safe, so stronger rivaling demons won't help here. It's more convenient to assume that he can't use these souls. Demons are always in some way restricted when it comes to deals and souls. If the origin of a soul is hell, then he can't use it to empower himself, otherwise he could. Could be God's law, hust an assumption though.