How could they be the same person if they look completely different? It's possible that Diane's friend Dolores is still alive but just isn't
this Dolores. Let's wait and see though.
And yeah, it's indeed possible that Nasiens and Dolores aren't real siblings but simply consider each other that.
Anyway. As expected, to Percy the Gorge is indeed closer to a Paradise than to Hell. He gets to have all the prey he wants.
I'm still iffy on the prophecy about the Four Knights destroying the world. I'm thinking it can still turn out there's either a misunderstanding in the meaning or the prophecy is wrong.