To me, the two biggest indicators of large success in the NBA are scoring ability and contempt of others. Jordan was the perfect package of this.
I first felt what Larkin said about 2 months into the season. Tatum wasn't playing like a rookie. Rookies force the situation, screw up and then play scared. He let the game come to him, took it right to the very best players in the league, and was very successful. I knew that he was a talented player... I just didn't know if he had the "contempt of others" gene. We saw flashes of it, but he is generally a low key guy. The dunk and stare down on LeBron was the final piece -- it cemented it for me. It was like when Neo realized that he was "the one."