Ultimately, the outcome here (from a Mexican viewpoint) is that Aguirre keeps some cards close to his chest. He didn't enter the match with his most formidable line-up. He experimented with a few options and has to be closer to knowing who is excluded.
Even more than that, he's got to be fairly satisfied with some things today. In part, I think he'll make an assessment on the basis of how the incorporation of Guardado, Blanco, and others affected the rhythm of the game and creativity in midfield.
I can't say that South Africa comes away with any keys to denying Mexico in the opening game. Uruguay won't be able to execute in the same way as England because they are slack in transition. France? I foresee a few problems defensively for Mexico, but this could be blunted by Mexico's counterattacking ability. Definitely want to ketch that game.