And his overtake at brazil didn't cost him the title it was the gear box falure that cost him the title because he was still in contention after the messy overtake attempt.
Yes, that's correct . Although it's never been determined what caused the gear box failure, the most probable theory was going over the curbing and through the runoff area at those speeds did something to the ECU.
Take another look:
http://www.youtube.com/watch?v=v7h8KzULp5UWithout a doubt, one of the most reckless maneuvers in F1 history. He should have just stayed where he was(P4-championship), settled down, and then gone after them. You don't win a race(or a championship), in the fourth turn of the first lap.