Spoilers as it is a question about end game. In the end, we have two options, either to let Pagan Min survive or kill him. I killed him, so obviously I can't redo that now. Apparently, if I hadn't kill him, he would have left whole of Kyrat for the player.
Now, question is, if that happens, technically, player replace Pagan Min. So, all those soldiers we were fighting becomes our own army. So, we should actually change factions, and start fighting against the golden path.
Sadly, I have no way to find out if it happens. Or if the game just glosses over that "whole kyrat is yours, you are my rightful heir" line from Pagan Min.