Tim Duncan isn't just a Top 50. He should be a Top 10.
Jordan, Magic, Byrd, Wilt, Robertson, and Kareem are really the only players I'd put above him. There's an argument for Karl Malone, but the sheer efficiency and performance when it matters that Duncan brings to the table puts him ahead. I'd honestly put him above Shaq and that says quite a lot (Shaq is hurt by his poor freethrow performance).