The peerage setup doesn't really make any sense at all. First of there must be some mistake with the two marquis titles, that can't be right?
But, seriously a system with 11 different titles? And with 2 times four families for the top 2... Does the author have the faintest idea how huge a country has to be for that to make sense? Even if most of them were just cosmetic differences. And how can the Elwyn family just be barons with the scale, power and influence they operate at. They should probably gave been a count family at the very least.