Did they knew all along it was sealed in there? If so, why didńt they warned us of what was inside of that thing.

Dont u think (like it was mentioned in some other post) that it will be weird that in just 5 years, all the cities are rebuild, everthing is pretty and Bahamut is just chillin out there?

SE placed the bar VERY high IMO and they better deliver a SOLID AND LOGICAL story.