I’ll take a look again when I get home. I was pretty sure it stated the planet was nothing but rolling chaos with entire oceans boiling and lands upheaval. And the first signs of life came from the primordial zones created by the keepers.
And if I’m right, neither can the trolls be truelly considered natives as they would be the creations or at least the byproduct of the creations of the constructs.
I’ll try to ask in the official lore forums but you know how Blizzard is about answering these kinds of questions.