I think Luffy mastered Gears stacking probably thanks to Adv CoC. This allows him to move as fast as G2 while having G3 firepower which is more useful than G4 in long battle.
Now the questions are : G4 only be used as a finisher or will Luffy find a way to diminish the draw back like he did with G3? Will Luffy be able to stack G2, G3 and G4?
Now the questions are : G4 only be used as a finisher or will Luffy find a way to diminish the draw back like he did with G3? Will Luffy be able to stack G2, G3 and G4?