Originally Posted by
Llugen
Hmm I don't want to spoil anything but if you didn't play through the Binding Coil of Bahamut story, then you might not know why Phoenix would in fact be a really (really really) bad choice.
Again sideshow if anything, Tiamat's rage by being unwillingly turned into a primal would make her all the more strong. This is my point exactly, they could do literally anything with any character, we have no idea what they might do. However, my above logic regarding Phoenix still stands; it's "already been used and wrapped up." The other mentions have not.