This may get me some flack, but this has to do a little more with One Piece than most other manga I've read. It's having characters pop out and say stuff that happened only a few moments ago.
"Ahh! He beat the pacifista in one punch!" Etc. Stuff like that.
It's called comentation/commentating etc.
And it's an ancient long cliche in manga, to the point where Sakigake Otokojuku had half it's panels during fight chapters devoted to characters describing what just happened to everyone who has already seen it, or parroting the lines the opponent just said, sometimes on the same page the line was uttered.
It got to a point where an opponent would say a line at the end of a chapter, then repeat it at the begining of the next, and that would get repeated again one panel lower.
If anything OP barely does it at all, whereas in SO it's extremely grating.