If Mclaren goes back to Honda power as rumored, then it could be possible for Button and Hamilton to assist. But, my vote is for Rubens. He's got so much experience, is a phenomenonal driver and is known for being a good car developer, i.e., someone who is good at working with the engineers to identify and fix issues with the car. Problem is, most Americans don't know who Jenson Button and Rubens Barrichello are. If you want this car to have the same effect in the US as the Senna/NSX combo did in Japan (where he is worshipped as a God), you need well known American road racers. Some names that come to mind are Mario Andretti, Michael Andretti, Paul Tracy, Tony Kanaan, Helio Castroneves and Dario Franchitti. You would probably need some NASCAR talent too, but most of those boneheads don't know what to do on a road course. The only two I can think of with any actual driving skill are Jeff Gordon and Tony Stewart. I say have a 5 day testing session at mid-ohio and give each driver a day with the car and engineers.