Did Sammie sell his soul? I've written about how I think Sammie might have sold his soul. The end-credits scene shows him with no scars. That means that it takes place before the events depicted in the movie. Does he attract Remmick because he has access to another dimension? Is the scene showcasing Black music in the middle of the film a sign that he can tap into the divine because of an encounter with an otherworldly being? The next film could show us the answer.
Somewhere out there in the multiverse is a movie saga in which all great dystopian sci-fi is united under one roof: a place where Xenomorphs stalk Na'vi for sport and Predators quote Rutger Hauer like they've just discovered existential rain.