Just had someone in the guild confirm to me that their 5 man group all got the mount. Is it possible the group forgot to have the loot set on "Personal?" Also, why take off all of your gear? As long as you are all grouped you don't have to damage him personally as long as it was someone in your party that got the tag.
Personal Loot was on and everyone was around him. Not too sure why he didn't give everyone loot, but we all put in a ticket to check and see what happened.