"Patrick Stewart also appears in this film and the 3 previous X-Men films, though his appearance is uncredited, with CGI used to make him appear younger, as was used in X3." If that's someone's way of saying Sir Patrick's 4th go doesn't count, then that's one of the flimsiest excuses I've ever heard. That's like saying Ricou Browning and Ben Chapman didn't play the Gill-Man, considering their faces weren't shown and they weren't credited with the role.