Finding a basketball star that can put up big numbers isn't the hardest task in the world. Finding a player that can not only turn your team into a winner, but also champion is much harder. This is why Michael Jordan is often referred to as the G.O.A.T, due to his 6-0 record in the NBA Finals.
But Bill Russell won 11 championships and the only time he failed in the Finals was due to being sidelined with an injury. Russell was about as close to perfect as could be. And comparing Russell to modern players is foolish, since if he had played today, he would have had all the 12 month training that modern players have.