Colin S Crouch wrote:Aronian is looking more like a world champion, except of course that Carlsen is a massive obstacle to try to get past.
Before today's game, Aronian was half a point ahead of Karjakin, with others being further behind. And the two leaders were about to play each other, with Aronian as White.
He made absolutely sure that he was never going to lose the game, and he played ultra-solidly, happy to play out even the slightest edge for a win, but also fully satisfied with a steady draw, if the opponent plays accurately.
Over the last few years, Carlsen has shown many times that even super-grandmaster opponents will sometimes slip up under small but continuous pressure. Aronian has of course studied in depth Carlsen's play, and leant from Carlsen's psychology. Karjakin suddenly missed a tactic,and lost a pawn!
Still, while these lines have been written, Aronian has probably not handled the endgame fully accurately...
Play continues. 
I am not sure that this game witnesses any extra dimension/learning from carlsen in Aronian's play. He has often played in this style as White, surely?
I am not sure whether I'd prefer Kramnik or Aronian to challenge Carlsen - I suppose that, when it comes to it, I would expect either to blunder a crucial half-point at some moment. Kramnik still the more likely to really pressurise carlsen from the opening, perhaps.