Formula One managing director Ross Brawn has defended a controversial algorithm-based ranking that determined Ayrton Senna as the fastest driver of all time in a fascinating exercise that stands up to scrutiny, despite some social media scorn.Formula One managing director Ross Brawn has defended a controversial algorithm-based ranking that determined Ayrton Senna as the fastest driver of all time in a fascinating exercise that stands up to scrutiny, despite some social media scorn.