I always wondered if other job/class mentors came back. I know during the attack on Ala Migho you see Cocobuki from the Thaumaturge guild make an appearance and send some fireballs at the gate/wall. I don't know if I saw any other job/class leaders, I was trying to keep an eye out for them. I kinda wished the old man from the Pugilist quests came back to help us monks out, just for fun.