Tiamat-Bahamut = connection?

[Chris]

Tiamat is actually Bahamut that Ultimecia transformed into a monster.
It was Squall, Rinoa and the other that had Bahamut.

When you scan Tiamat you get:

Tiamat
Used to be a GF. Became a monster under Ultimecia's power.
Its Dark Flare destroys all enemies.
Not only they look exactly the same to the exception of the color.
(Which is due to the transformation Ultimecia/Rinoa did to them)
But there is also their attack.
Bahamut attack ? Mega Flare.
Tiamat attack ? Dark Flare.