Willa:
How about this: the Kaetyma and Doola Tywuar do not have the draconic lineage that they claim/that history tells. Instead they are the descendents of some culture that sought to steal the power of dragons. Some dark ritual was conducted by ordinary people somewhere that basically ripped the dragons from the world and forced their essence into the ritualists, creating these two draconic races from their mortal bodies and endng the dragon species in a single foul swoop. That's not to say that those races today are evil, just that their forefathers were.
This brings to mind mythic history. The idea being that you have "real" history which is what actually happened and another version which is the idea of what happened. In mysticism both histories are
real and equally valid. A story after-all is just another form of spell.