I do this on heroic just to make it fast 14-16s kill.
Now there is fine line where you can actually make it and all your toons will be in the same "dimension", if your dps is fast enough, around 6k per toon, and 4 dps You will make it fine, if you screw up he will die, but might take you to the insanity thing, which sometimes will spawn clones and sometimes it wont.
The bad part is that You cant really complete the quest for corpse thing if insanity happens, but you can still all loot him, even thought the small bag icon isn't showing when you mouseover dead boss.