Do we have any evidence of that though? If it only really affects one continent, and leaves every nation there intact, does it really count? It's really only a Calamity to Eorzeans, and a pretty wimpy one at that.
On another note, do we know why Floods are bad for the Ascians? Does rejoining a Flooded shard pose the threat of permanently screwing up the Source? If anything, it seems like it'd be easier to rejoin the 13th than any other shard, because the barrier between it and the Source is pierced regularly without any Calamity.
I wonder if Solus isn't interested in the First and light-aspected Black Rose because he wants the First to be as flooded with light as the 13th is with dark, so that the First can be rejoined at the same time as the 13th and counteract the imbalance.
