One thing to keep in mind when coaching elite athletes: The best want to get better. Rarely are they complacent or satisfied with where they are. This is a significant part of what makes them the best. They take pride in their craft.
There is a great article at Training Ground Guru about Rene Meulensteen’s coaching process with some of the best players in the world that illustrates this point. Meulensteen served as the “skill development coach” at Manchester United under Ferguson. He was hired to improve the skills of the first team which employed some of the best players in the game.