Has to be Ken Miles.
Shelby had an idea for the Cobra, Ken developed it into a winner.
Shelby wanted to build a 427 Cobra, Ken developed it into a winner.
Ford wanted Shelby to race the new Mustang, Ken developed it into a winner.
Shelby and Brock wanted to design a car to beat Ferrari, Ken developed it into a winner
Ford wanted Shelby to race a GT-40 and you guessed it, Ken developed it into a winner.
Sure, there were a lot of great drivers, mechanics and manufacturers during this time. But, if you had to pick one guy, it has to be Ken Miles.
If you are still not convinced just ask Carroll Shelby.
I honestly think if Miles had worked for Duntov, history might have been a little different.