Is there anyone in our roster that really uses energy to fight? Also, his fighting style doesn't go in line with that type of strategy of tanking hits either, as his main thing is agility and keeping on the move. And while energy is energy, he can't absorb kinetic energy, only stuff like what comes from the sun or fire or lasers. Heat-based energy, I guess. Also, if he gets hit by a big attack, like you say, he's still going to feel it. It might not be as bad, but it'll still hurt a lot because it's a big attack and he doesn't negate all the damage. And it's not like he can snap his fingers to enter this state of energy collection, it's like meditation, it takes a little while to get into the zone and when he's in it, he can't just snap back out.