So, I don't really understand how Roland's mother is reading him a story in which there is a character (Covenant Man) who is so obviously Marten/Flagg. How would Marten have ended up in a children's story? How would Gabrielle not have recognized that as him? How would Roland seemingly not recognize Marten as the Man in Black much earlier if he knew this story by heart? Did Marten actually spend time as a tax collector, or is that part fiction?