“Wilt Chamberlain didn’t have the competitive instincts that Bills Russell had”: Hall of Famer, Lenny Wilkens, dishes on his Lakers and Celtics rivals’ mentalities

Lenny Wilkens believes that Wilt Chamberlain never had the competitive mentality that drove Bill Russell to winning 11 championships.  The greatest winner in North American Sports history is undoubtedly Bill Russell. In a vacuum that is. His 11 championships in…