Neither, Jackson's problem is processing speed. He is unable to translate what he is seeing into reaction time at a normal speed. I suffer from a similar issue and to date it is not fixable. Watch when someone crosses his face, watch how long it takes for Jackson to respond. It has nothing to do with his intelligence and certainly nothing to do with his physical ability, he is a beast, but will never be able to respond to something that doesn't go the way he is expecting from an opponent. I think he would have been better on defense, so he could have been the one dictating the action. Only problem there is he doesn't have that killer instinct. He will NEVER be a consistent OL starter, he just won't.