In terms of fighting skills, Rumble Johnson
Most people think he is a wild brawler with little technique that just hits hard and has no cardio,
but in reality his technique was very underrated and he had the best striking defense in all of MMA. He wasn't rocked a single time in his career, even when his brain was completely dehydrated at Welterweight. You can probably count on one hand the number of times he was hit cleanly with a power punch during his LHW run, and he also displayed great cardio in his 3 round drubbing of Phil Davis. His problem was always his lack of fighting spirit, not his stamina.