Not everything was fully answered but I remember a quote from Rust about how "This is a world where nothing's solved.."

I think all 5 of the main players in the cult were killed or died.....Yeah there were probably others involved but I think Marty said that you can't get em all, it's not the world we live in......The little girl in the hospital said that the man with the scars was the worst so it makes sense that they got him last