Just a conspiracy theory. Jenson Button is not a popular guy on the grid. His lack of performance in the recent races mean no one thinks he is a worthy champion. Rubens Barrichello is generally liked more on the circuit. Button is not confirmed to drive for Brawn GP next year. He is asking for more money, Brawn is not ready to give him more. He might move to a rival team next year. That means Brawn GP would probably lose the Number 1 car. So, they could be working on giving Barrichello the better car to enable him to win the championship.