Luffy took satisfaction in beating Arlong for what he did to Nami. Orochi's treatment of Wano's residents fueled Luffy's hatred towards him. It's hard to get on the bad side of Monkey D.

One Piece's Five Elders may be even more resilient than Kaido, evidenced by Saint Warcury's ability to withstand Luffy's Red Roc attack ... the Nika Fruit. Since Wano, Luffy has advanced greatly ...