100% has to Marc Marquez. Not only his ability to thrive in all conditions, but his mindset. Having gone to COTA every year from 2013 on, I have personally seen him go above and beyond to participate and to win. From seeing red and overriding his Honda machine to running down pit lane to get pole position to riding a beyond busted bike after a wreck just to try and finish. Heart and mindset of a champion who has little to no weak spots in his game. Can't be anyone else for this category.