Dirty-boxing is very important part of MMA fighting. Rank these great fighters at this aspect (in their respective primes): Jones, Cain, Fedor, DC, Overeem, Wanderlei
Couture invented it, so he needs to be on the list. In his first fight with Vitor (who was supposedly unbeatable at the time), he put on the dirty boxing clinic. Randy didn't have too much power in his hands, and became more of a wall-n-staller near the end of his career (see his awful fight with Vera), but he definitely belongs on this list. I'd also add Carwin, though his career was short. He probably had the nastiest short punches ever (Mir fight).
1. Couture 2. Cain 3. Jones 4. DC 5. Carwin 6. Reem 7. Fedor 8. Wanderlei Wanderlei and Fedor don't really belong on this list... and Reem has more of a Muay Thai clinch but w/e.