I... have a slight theory, but it's kinda a niche darksteel foil hat theory.

Maybe... just maybe...... the Au Ra (I'm thinking Au Ra is singuler and plural like all the other race names) Are ACTUALLY simmiler to what form a Dravanian takes in it's home land. Because personally I refuse to believe that the Dravanians are literal dragons all the time. Or who knows, maybe the Dravanians turned them selves into full dragons at the begining of the war (For Long Life, great power, ect) and USE to look simmiler to the Au Ra.

I think there could actually be a connection between the Au Ra and the Dragonkin that goes far past their apperence. Because we only know two things about Oethard for certin. The Domans are from Doma which is between Garlemauld and Eorzia, and that Garlemauld it's self is in Oethard. So who's to say who or what is actually up there as I don't know of any NPCs that have seen Oethard (Save for Cid, Bigs, Wedge, and the Domans them selves who all refuse to speak of it)