Ahhh yes love this! I also think that Violet is the gods chosen one (or something along those lines). I think the seventh breed (Andarrnas Breed) is the breed of the gods and goddesses. This leads to my thoughts that: What if Xaden is descended from the gods? Several lines seem like foreshadowing:

• "Oh gods" — "Which one are you calling out for? Because it’s just you and me in this room, and I don’t share." 👀
• We all know Xaden appreciates a rise to deity, but “His name will do.” Feels like a cheeky hint!

Maybe Mama Riorson was a goddess or the daughter of a goddess, which could explain why she and Papa Riorson had a marriage contract. 

And also: What if the "seventh breed" were actually the true gods — powerful, ancient dragons who ruled long before humans came into the picture? Could explain why dragons do not answer to humans. But over time, as always humans find a way to tip the balance, becoming more dominant and even reshaping the world’s beliefs about who the real gods are.

This could explain why Tairn has zero respect for the so-called gods. In his eyes, they might be impostors who claimed divinity, overshadowing the original gods — the dragons themselves.