Siu said in the blog post for this chapter that the soul-stirring ladle part ties in with the next arc, so i think the reason madoraco wants it is to give emily a soul so he can ignite her, and the next arc could be about emile.
I don't think so, since it doesn't seem the guardian can have a child if it's alive. This is certainly the first case we are seeing.
Also, iirc, it was said that the monster inside baam is a devil who once had power similar to god, so it's probably a shinheuh