Pretty sure the idea is to give him temporary leeway to do whatever the hell he wants on that piece of land the wall is on without any diplomacy issues until the war over at which point he can just give the land back and leave the wall there for the future.
@Cylos Those dresses are probably custom made for her since she is so fat. I doubt enough people that are her size would also be rich enough to buy those gaudy dresses and be okay with them being second hand. There is likely no market for them.
The title is 6-sai as in 6 years old. He's 6. He will probably be 6 for the whole story because that's in the title. When page 11 calls him a teenager either the author or the translation group messed up. He may act mature but he's a kid and nowhere near grown enough to be confused for a teen.
Any chance of the scan group going back to fix the unreadable mess that is chapter 55? I don't know what language that chapter is in, but it sure isn't english.