Namely, the surrounding talent. There have been so many great players who didn't benefit from having other greats around them during their prime. Jordan, Magic, Bird, Russell, and Steph each had a heckuva advantage that no team could concentrate on them solely during most of their careers. If I had to name the top two, it would be Jabbar and Wilt because they proved themselves on teams that otherwise were pretty ordinary. And anyone who watched the pre-injury Walton while the Blazers were at the top enjoyed one of the most unique weapons in NBA history.