I don't know why Nael would be in ARR; it's assumed he's dead once the story fight ended, unless something else is going on. Rivenroad (Hard) was designed for a greater challenge and to exclusively reward the players capable of winning the fight with the earrings.

Really, any content that's permanently disappearing in ARR shouldn't have remnants of it popping back up after the fact. It's assumed either Castrum Novum or some other Imperial Base will be in existence since those items will still be there.