Luffy himself was treated as a side character for 98% of the arc. He doesn't have any impactful moment since that inspiring speech in Udon. Even the panels with Luffy vs Kaidou didn't have good meaningful dialogues. Probably the only arc Oda treated Luffy worse from character and fighter POV. Ironically this is very important arc to the road of pirate king.
wdym side character 98% of the arc
he has by far the most panel time , 2nd is closer to half of the focus he has got
he had dedicated chapters to a mini training sequence in udon
and then he had the moment with kaido after he hurt him for the first time being compared to ther great pirates?
or when he came back with momo and gave him the confidence to attack kaido?
literally what are you talking about.
arc could do with oda giving more time to other characters bar him
a lot of these fights were rushed