Quote Originally Posted by Onisake View Post
we will likely be restricted to 'terrestrial' summons. such as Carby, Phoenix, Fenrir, diabolos, and bahamut.
"Terrestrial" summons were tied to the FFXI lore. Final Fantasy in general doesn't make a difference between summoned creatures.
Besides, we've already seen Bahamut in the opening, and it's skeleton rests with a wrecked airship in Mor Dhona.