Things you learn. Masato Yagi, who directed Rise of Mana and worked among other things as an event planner (writer, I think) for Code Age Commanders worked at some point on Versus XIII.
I'm pretty sure 15 Bahamut comes out of what's supposed to be Dalamud from FF14 lol his sword even drops exactly like one of the ships that falls from Dalamud in the cutscene for A Realm Reborn.