Man... I don't really care to learn all this incredibly specific info about Fey we aren't even sure we'll see often. If it's like this every time we see new Fey then I'm pretty sure I'm gonna be skipping entire paragraphs worth of info dump every other chapters.
Yes, this is what he needs to do for his sister. Bring her to the market and see which fey she is most compatible with. Don’t just buy something that looks right.
