I think the key moving forward will be keeping a consistently good team playing around him. All the guys who have gone down as legends of the game played in really good teams for most of their career.
You look at the guys who have dominated the modern game, Smith, Thurston, Cronk, Slater, Johns, Lockyer etc played most of their careers in strong teams both at club and rep level and they played better being those teams as well as making the players around them better.
If we can keep a fairly consistent roster for the next 5 or so years then we'll see the best in Ponga, especially when we finally have a forward pack that can dominate teams. Considering how good he is now without that much go forward in front of him he could be anything playing on the back of a big aggressive pack.