A simple, easy theory

[Ryushikaze]

Pharoah, your explanation doesn't work for two reasons. GFs cannot be 'energy beings', because Energy does not stay around and collect itself into distinct forms, as numerous GFs, such as Ifrit, Odin, Tonberry, Cerberus, and Bahamut did.

And Gilgamesh, but then again, he came through a dimensional cleave from FF5's X- zone.

Now, it seems they can leave trace amounts of themselves in places as electrical signals, which would suggest they rest elsewhere until called up by those their piggyback signals are residing in.

Addendum: Brain fart- it also fails because Galbadian soldiers, not junctioned to GFs, have stocked magic. Kiboshes your theory.

And while people can have differing perspectives, empirical support is expected.