Quote Originally Posted by boys from the dwarf
but how come marche and ritz are back then. werent they returned to the real world at the end? its true that you can continue playing after the end sequence but how do marche and the rest end up back in ivalice (by ivalice i mean the one with swords and sorcery not s.t ivalice.)?
Well, as far as I know, the only theory which has a logical explanation for that is mine! No one else has even attempted to explain why they still exist in Ivalice after the destruction of the crystals, which is one of many reasons why that theory is so awesome.

However, why it happened doesn't matter. It did happen, and no one can dispute that. You can continue to play in Ivalice with Marche, Doned, Cid, and Ritz, and that plot clearly states that Mewt left Ivalice.