oops lol forgot I trailed off there. My thoughts are still jumbled here.
okay, so maybe there could be types of dragons, green, blue, etc. and each have specific talents. So a long time ago the ancestor dragon leaders maybe booted one of the types out. Example being black or green, because they saw them as to cunning or ambitious or power hungry. So maybe a dragon for this line could have teamed up with bg, kinda leading him to this place. Using BG to destroy the planet. OF course BG got into all the books and studying and found out about the weapon thing that i havent figured out yet. I was thinking about making the dragons be able to tap into the energy that went into creation. Like the energy of life. anyways. This bad dragon wanted to use this weapon or power to create a new world that he would rule, wiping out all dragons but his own kind, or those he could control completely.
But of course BG has his own plans. Destroy the universe or become the leader of all, whatever drives him.
Anyways I thought it could add some extra depth to the story.
For things to come I think it would be good to send Dorian to Earth as you said. I do like that pause in some stories where they end up back where they started and its almost an opportunity for the character to decide what they want to do, or what they really want. Plus it'll give Trish some more screen time.