Luffy's Gear 5 design ... as this is the signal that he's about to unleash the devastating Gear 3. Gear 3 is incredibly strong, and can deal serious damage to the likes of Rob Lucci.
Luffy's attacks in One Piece show his evolution from undisciplined creativity to disciplined technique. Gear 2 and 3 exhibit Luffy's passion and strength, while Gear 4 combines this with ...
Volume 111 of One Piece corrects mistakes, changing Gear 4 to Gear 3 and adding missing details ... some changes were made to Luffy, and a few mistakes were corrected.