I believe that their is a mixture this year in the components that must be used to insure a victory. First, you must have a drivable robot. I think that the key to being able to compete, like stated above, is that the bot must be menuverable.
Second, you must have a strategy, no matter how good your driver is their ain't no way in h@#! that he/she's going to perform well if he/she doesn't know how to utilize the opponent's weaknesses.
Thirdly, comes the driver/driving team. The advice that is fed to the driver is just as important as the actions that they take.
Fourthly, there is luck/fate. I beleve that the outcomes at some of the recent regionals this year would not have been possible without a little of this.
I think that it takes a well rounded team to become a true champion.