luffy has mastered his 4th gear

On one piece chapter 975, in this chapter denjiro reveals his true identity even he frees the samurai who were held in Rasetsu prison and this chapter also says that the combined forces of the samurai wano actually survived, then with their power now, it looks like a big war will soon be in start

besides that, there is an interesting thing in this chapter that is when luffy attacked the kaido crew, he used gear 4 and after destroying one of the ships, luffy had a chance to fight with kid and law, from here we can see that luffy was fully mastering gear 4 of hers, this is proven by Luffy being so easy to release gear 4, unlike before the more visible body luffy burdened

from here, we can see that the power of gear 4 has greatly increased, because with just one hit, he can destroy a large enough ship with the help of law and kid and this shows that Luffy's training with Hyogoro's grandfather was successful, Luffy can destroy objects without touching him , this means Luffy can use advanced bushoshoku no haki on his 4th gear

like it was before, regarding Luffy's gear 4 enhancement, let's wait for the awesome power that Luffy will release when fighting Kaido later