I think you are jumping the gun a bit. Jack is still the premier player on this team. I fully expect Rasmus to join him in short order, but he is an 18 year old being asked to play the toughest position outside of goaltender. He is the shiny new toy. I get the excitement but I would hold off on the coronation for a week or two. I also believe Jack will,welcome the help and offer the same to help him get up to speed asap. I do not think of it as having a premier player replacing another but rather adding a premier d man to a premier center. All good.