A plot point brought up in the backstory was that each of the earlier calamities was aspected to an element (e.g. Sixth Umbral Calamity = Great Flood = Water), yet the fall of Dalamud was unaspected (in spite of Bahamut's rather fiery entrance). I'm wondering what the aspected nature of the old Calamities means in regard to the Rejoining phenomena.

So were six of the thirteen Reflections of the Source each strongly aspected to one of the elements (like elemental planes in D&D), yet the shard rejoined with Dalamud's fall was normal? Where did Oha-sok even get all that water to flood the world after the Magi made the elementals too angry?