http://www.youtube.com/watch?v=Wa-YXWSRsXs at the 2:44 the tank is the shrunk human warrior who is not the closest.
http://www.youtube.com/watch?v=k8fLD...eature=related at the 1 minute mark, im not sure who is tanking, but it isn't any of the people who are close and behind the mob and noone is standing in front of it.
http://www.youtube.com/watch?v=zH-W7fPES9E at about 1:10 you can see the dwarf warrior getting knocked back and not being the closest, but yelinak doesn't spin to someone else.
I put in 10 years on live and really don't remember any of the killable npc's who were permarooted attacking the closest pc. I am not saying there isn't one, but most of the permarooted mobs used in the top "raid" zones from Kunark to GoD had aggro tables. If they didn't they would be saying give the warrior a shield and who care what kind of threat he has, he won't be loosing aggro.