Red-eyes darkness dragon wont see play in the game, its too overdue. Atticus, on the other hand, could come with DECENT red-eyes skills (differently from joey)
Red-Eyes Darkness Dragon would never see play even if it was not "overdue", since it's just regular Red-Eyes Black Dragon with mediocre ATK boost effect.
But Atticus could also have Red-Eyes Darkness Metal Dragon with him, which is the one we need.