People really want their cake and want to eat it, too... judging just from the video Square released the rogue class is a DD class. And the Ninja Job is a DD Job. Not unlike lancer/Dragoon or pugilist/Monk. This means it's got DD down pat. So what would you do with a Thief Job? Can't be a tank without drastically changing rogue through Job abilities. Could be support, but I have a feeling rogue will have that covered in all the Thief sort of ways, or maybe Ninja. Oh, before it's called out that Ninja is going to be a tank, Ninja was never a tank. Your one and only reference to Ninjas as tanks is actually a perversion of one line of their spells originally meant to keep them safe from aggro. That's it, just Utsusemi. Ninja in XI had no innate enmity generation as was present in the actual tank jobs.