I hope that they have a writer or a designer keeping track of all the information used in the development of the games.

As far as I know, even with the Ultimania guides for various titles released, there is still considerable confusion as to the state of the world of Ivalice. As far as I know, the following games are included in the actual world of Ivalice: Final Fantasy Tactics, Final Fantasy Tactics A2, Final Fantasy XII, Final Fantasy XII: Revenant Wings, and Vagrant Story. Is there one that I missed?