There’s some things in Lundi’s theory I gravitate to, the relationship between Sestren and the Dragon is so deliberately mysterious, and their reunion has that almost preordained cast to it. I’ve always felt there’s a story there we couldn’t possibly know, so I never really tried to look for it however.
I can’t even decide if I object to the theory as sounding like The Matrix, or if that actually makes it more compelling… because that story could very easily have taken some inspiration from Panzer Dragoon anyway. Still, it’s more in line with my initial take on things than perhaps the more recent personal revision, in that I used to view the dragon more like a recessive gene in the core system.
Chizzles, the voice of Azel seems to be a message left by her for Orta, hence her voice.
As for Abadd, the Ancients clearly engineered rigid protocols for their living creations, and the drones have been depicted as particularly specialized and controlled usually. Just because Abadd could create the dragonmares - which seem like hybrids rather than normal pure-types anyway - doesn’t mean he had any way to access the level of technology that could make more drones. But Orta already had the genetic key for reproduction, I think that’s what Abadd was after…
I think the battle with him inside Sestren represents his attempt to force her into a place where he could access that genetic key. Perhaps he also used her to reach security levels he himself could not.