The more I've looked into the nightmare that is Iraq/Syria, the more I've been impressed with the Kurds. They seem to be making a good go at democracy. They have bravely been fighting ISIS hordes.
You're suggestion, VI, of three separate states makes sense. I can see one major problem: I'm not sure if the Sunnis would be that enthusiastic about wiping out ISIS. If ISIS remained, they would never be satisfied with their allotted area. I believe their motto is 'remaining, expanding' - in other words their borders will always be bloody. As long as they exist, they'll be constantly at war with everyone else.