Now you got me started: :rolleyes2

I think that Bahamut could be Tiamat in the future, corrupted by Ultimecia's influence.

1) Both are dragon GF's (same design, different colors!)

2) Both use Flare attacks (Mega Flare vs. Dark Flare!).

Also it's plausible that Ultima Weapon is Omega Weapon in the future, having lost the sword and gained a lot of HP. BTW, why is Ultima Weapon carrying Cloud Strife's Ultima Weapon? Hmm....