No, you still have not seen episode 202, where the Pharaoh's Protector defends him from Yami Bakura in Ancient Egypt, eventually, Seto duels him for the Millennium Rod, or so I think. ALSO, why would the father of Marik let him possess the Millennium Rod if he knew that it corrupted the souls of the person possessing it. ALSO ALSO, Marik turned into Yami Marik when he was introduced to the outside world, a place where NO Tombkeeper is permitted, not when he took the Millennium Rod.