I wonder how they will introduce level sync in to a place like Eureka. I'm sure SE don't want players to abuse how they can get xp by letting them sync down and attack easier mobs. I'm sure they also don't want to introduce a level sync system that would make them lower level but still be unable to get xp from mobs. Neither is good at all. Sure they could just make it so you no longer affect the xp gain of others but I doubt many would do it if it meant they got -nothing- from it.

I don't play CoD so I don't really know anything about the prestige system OP is on about and how it can be adapted for XIV.

Not saying I don't want level sync, I do. I'd love to be able to help other players without obliterating their xp gains. I'm just not sure how it can be done without any abuse while still rewarding everyone involved. Eureka, as I'm sure I don't have to explain, isn't like other areas of the game where you can level sync.