The Dark Tower series in incomplete, anyway (Score 2, Interesting)

Many Dark Tower fans praise Wizard and Glass as the best of the series. And most fans will agree that there are many unanswered questions at the end of Dark Tower VII, so any exposition, even a comic book, is most welcome. I did not like the way Randall Flagg was handled at all. The "resolution" of his story clashed jarringly with everything that was known about Maerlyn, and about what kind of creature he was ("His name is Legion. He is the King of Nowhere.") There is a lot missing about the nature of the Guardians, Maturin especially. Most of all, the connections with other books aren't satisfactorily resolved.. for instance, It... is It simply a glammer, a vampire, or something more? Is It the Crimson King himself, and is Black Thirteen the object that It arrived in? Are the Deadlights what everyone thinks they are? What is the connection between The Mist and the Dark Tower series? And what are the names of the rest of the Guardians, besides Shardik and Maturin?