That's it, now I'm confused as hell about how this hierarchy works.
I'm trying to get an achievement that requires you to basically die to a standard enemy, allowing him to be promoted to a captain, and then getting that captain to become a warchief, just so you can kill him and exact your revenge or whatever. That's all the achievement requires you to do.
So I died to a standard enemy named Skog, he became a captain, and then I advanced time a bit and his power rose. Then I told one of my warchiefs to start a riot against Skog, and during the riot I killed the warchief, and ensured Skog stayed alive. So Skog should be the new warchief, right? Wrong. Ushgol the Drunk is now warchief, and I have no idea where he was when this riot took place.