Well. That was a shit ton of information that I read on both of your half.
Now your information makes sense, Exit. Like Angel said,we can easily make the third group the bad guys who created the 3 Day war. I also have no problem with parts of the groups being integrated into PL. In fact, that could really work out for an attack that may happen inside the Lands during the 5 year time skip.

Angel, love that idea of the Half-Dead. Kind of reminds me of Ghouls from Fallout. I say that we make an actual city in the ruins somewhere close to the lands. Almost as if they're creating a bartering system. It gives the people a place to go without having to travel across the Red Wastes.