Agenda aside, it is pretty lame that Roger, the king of the pirates, didn't actually use a gun in combination with his sword. I mean, pirates are literally most associated with both blades AND firearms. You would think Oda would have made Roger's real fighting style be that he uses both in a fight. Because of Chapter 0 where he IS holding both his sword and gun I always thought Roger had that sort of Edward Kenway style of fighting where he slips his gun out to shoot while he is sword fighting.
But nope, Roger is just another swordsman with a lot of Haki. There is nothing that really has him stand out combat wise even on his own crew. I mean RAYLEIGH is also a swordsman which is another reason why I thought Roger had to be more of the traditional and more well known idea of a pirate when it came to fights.