Matt Francis walked away from R/C with a 6 figure income. For a new challenge and career path. Now he's a successful realistate agent in the SF area. I'm not saying Naoto is actually leaving racing. But he's accomplished more as a driver than 99% of us ever will. He's won a world title in on road every year he has competed at a worlds event. I don't know his history at off road worlds. But I doubt there's anything left for him to accomplish as a driver. Most people drive like there personalities. And Naoto gets out of the way for no one. So I think he's ready for a new challenge in life. But your guess is as good as mine.