Originally Posted by
VictorSpoils
You know, looking at this again, that could indeed be Bahamut on the right and Ratatoskr on the left. It does resemble the summoned Bahamut, and differs quite a bit from the rest in appearance. This art also dates back to Heavensward, well after the primal version (and other concept art) was seen, whereas the Ratatoskr painting appears to have the signature narrow head. There do appear to be fake Allagan "horns" on Bahamut's head, but they alternate with what look like real horns matching the color of his body.