User blog comment:DomoGanchan/Luffy will have 6 gears?!/@comment-30109381-20170213143812/@comment-31179004-20170215114817

maybe his 4th will get even stronger or he will develop the 5th on totto land arc we may never know, but I'd like to think that as he battles out the yonkous (not including shanks) he needs more power than what he currently shows with his 4th gear. Just maybe...