His jab is awesome and combined with subtle half steps and solid footwork its his foundation I believe. He does vary it with ease. Touch and turn over into hook, stabbing to the midsection then head, belly then head, rinse repeat. When Duva started all of the KRUSHER talk and ko hype I hoped he wouldn't try to fit a stereotype and be some bomb thrower with no imagination. But man..Kovalev has gears and under Jackson you can see everything in unison. Kos are great..but watching a guy dress it up and skill his way to handing out concussions is even better. Very smart fighter.