I've never seen it as the show having ONE main character but plenty! Granted what with seeing the last of season 6, Jon has showed himself in the forefront a bit more. I still claim there's a billion main characters in this story. Well almost. Cersai, Aria, Jamie, Sansa, The Hound, Daenerys, Theon, Thyrion, Bran... I could go on. To me that haven't read the books, ALL of them are just as important to the story. *shrug* :-)