I'm not entirely sure. I'm trying to google it, and there's some mentions that it's brought up in the Dissidia Ultimania, but there's no confirmation as far as I can tell. I did find an awkward statement from Nomura that says something like "Take it as canon if you want.".. wtf 




!


considering Ifrit, Shiva and Bahamut are pretty much staple FF summons...
instead of Shiva or Bahamut... I like them as summons, but they are always put in every game.. they're too common. I would have prefered something new.