I think Fedor, the GOAT, stressed the importance of ability to think as a fighter in one of his interviews, and one of the very well known trainer, I think JAckson, also referred to him as very smart fighter. On the other hand, Bruce Lee was quoted in a movie or maybe in an interview, how you don't think, but feel. I think something similar along that line was what Michael Jackson once said about dancing, which is another form of physical expression using your body. Boxing for instance is in a way dancing with your partner, but trying to rip his head off. So, what makes a fighter smart? IS it an ability to stick to a game plan? But, it's mere adherence. Is it being able to use faints/set ups/combinations? But it's just as much to do with techniques. What makes fighter 'smart' fighter?