The patriarch mentioned the Uroboros-god of all dragons, but in D OS 2 the Prince of Shadows says that the lizards were dragons, but the remaining 6 races united against them and almost destroyed, because of which, perhaps, Zorl-Stissa turned them into lizards so that they spared by other races
I never actually finished Divinity 2, Dragon Knight saga, so I can't say anything about it. But assuming you know your onions, it's still don't change the fact that Larian can change the lore of their previous game any way they like. Larian's Divinity series isn't like the Elder Scrolls of Bethesda's, where the latter has to put some serious arguments and justifications to the active series fanbase for every slightest change to the lore. Larian can say in the next game that all races came from another planet on starships and everyone in Divinity fandom will buy that. Everything what if matter for most of them, it's some cool and flashy turn based battles and roleplay.
