I dont know if AlphaGo is "beyond" all human players.

Given AlphaGo has learned all played games from a database, its more like AlphaGo is the essence or the sum of all experience gained from those games played. AlphaGo is better than every player (perhaps), but it has not pushed the game further by itself.

Not all games came from a database. It was initialized with a database. It has played millions of games against itself to improve beyond that. Next they will skip the bootsrap initialization and use all self play.