The Binding of Triad

[myahele]

In the case of Sephirot, he had a special aetheric property that allowed for extreme growth. This was later harvested and used by the Allagans in their experiments which explains why there are so many giant creatures. And why Xande, Phlegethon, Amon, et al. were so large.

I speculate that the remaining Triad have special aetheric properties, too. Maybe with their powers combined they can make unlimited aether/power?

[Griffey]

My theory is that their bonds are self sustaining, so Fiend powers Goddesses' bonds, Goddess powers Demons' bonds, and Demon powers the Fiends. This way the allagans don't need to keep an army of worshippers (like the Meracydian dragons kept inside Dalamud to keep Bahamut sustained). After all they are supposed to be a triad, which implies they are part of a set and that can't be just because they are all Meracydian eikons.

[Morningstar1337]

My theory is that their bonds are self sustaining, so Fiend powers Goddesses' bonds, Goddess powers Demons' bonds, and Demon powers the Fiends. This way the allagans don't need to keep an army of worshippers (like the Meracydian dragons kept inside Dalamud to keep Bahamut sustained). After all they are supposed to be a triad, which implies they are part of a set and that can't be just because they are all Meracydian eikons.

Except the Scions that went with Unukalhai and us noticed the Tree-like people in stasis while fending off the Garleans. Which would be redundant.

Its more likely that the set is because they are all base off certain bosses from Final Fantasy VI an the name "Warring Triad" is more for familiarity's sake