For me it's Fedor Emelianenko. Reason being he doesn't have the best striking nor the best jits. But he finds a way to win..... and he is always fighting guys much larger than him. He did this consistently against top competition for 10 years. JBJ is none of those. He is gifted with his frame and fights smaller guys. I will say JBJ is probably the fighter with the best fight IQ. But the only way for him to surpass fedor in my eyes is if he holds belts in at least 2 divisions. Maybe 3. I mean hey, he said it wasn't a challenge to drop down to 205, so maybe 185 is possible.