While I find very jarring a full on chapter for X Drake a character that I literally don't care, in the long run I think it will payoff, his actions as double agent means the arrival of the navy in the future and that means an all out war.
Onigashima has been a little disjoint, sometimes drags too much but at the same time it moves so fast that things get offpaneled or characters just pop, but the biggest problem is the completly lack of tension and stakes, we are in yonko territory in a war but everyone is happy, I think all our criticisms can easily change if the raid eventually fails, giving the SH a lesson and returning the yonko the respect and power their deserve, if this is the plan then Oda achieved his goal of giving us this feeling of calm but if that doen't happen the raid would be a complete narrative failure.
We can just wait and try to enjoy.