First post, sorry if this has already been made. I'm a huge lore fan so I dislike inconsistencies. I never played 1.0, so that's likely the source of confusion. Please correct my version of the events below as necessary.

From my understanding: Gauis conquered Ala Mihgo with an unknown legion probably 2-5, forming the VII legion with the citizens, which was given to Legatus Nael Van Darnus. Gauis's legion was mostly destroyed in the Battle of Silvertear Skies, forcing him and the Garleans to halt the invasion. Midgardsormrs's "death" caused the release of the primals aetheric energies, enabling their summoning. Discovering this, Nael sets into motion Project Meteor, with the intent to destroy Eorzea. Gauis opposes this, but with no legion, he can't stop Nael. In the 5 years since the Calamity, Gauis gains control of the XIV legion, and against Garlemald, attempts the subjugation of Eorzea.

Based on the accuracy of my understanding, I have questions about the way this happened.