The final part of ARR story doesn't make enough sense.

[Dererk]

Ok to clear a few things up we still have the echo its the blessing of light that was sealed by Midy the echo is our deffence against tempering from a primal and lets us comun with different races and understand other languages ie beast men.

For why the Merlyweb and Kan E did nothing this is a political reason if they just jumped right in it cause problems Garmald has a new younger stronger emperor now who is gathering his forces for another invasion of eorzea they step into the crap going on in Ul dah right now it rip it apart and give Garmald a perfect spot to start their invasion right in the middle of Eorzea.

Al mahigo was invaded very easy because of this very reason they had the strongest standing army in Eorzea but internal problems fave them an opening to be invaded Rhaban being an Al mahigan refuge probly knew the same thing would happen to Ul dah if an all out civil war started so opted to tell the others to run away so they could find the real conspirators. And thats why it went down this way if Ul dah was in a civil war its outing a giant HEY ATTACK HERE WE GOT PROBLEMS HERE MUCH EASYER TO INVADE HERE.