The thing about the terms "complementary talent" or " complementary piece" or "complementary player" is that when used in the context of American sports, it is generally a derogatory term. When Ainge used the term on Olynyk, he was using it to say, he won't be a star, he doesn't have that type of talent. His talent is only good enough to be a role player that plays along with the players that have the "real" talent, so to say.