Oda created that entire subplot of the bombs + the fire demon by Kanjuro to keep Yamato running around for 4 months / 12 chapters, and then in the end it was just setup to give a "solution" for Big Mom
and it was a shit solution in the first place
also, weren't the bombs suposed to create this insane shockwave? that even when Onigashima was only "kinda close" to the Flower Capital, it would kill everybody? Now Onigashima is pretty close, even if Momo has stopped it and is pushing it back a little, i doubt the explosion on the panels are gonna be big enough to compare to the fake threat
once again, another use of fake tension by Oda
just like how last chapter, once again, Law said that was gonna be his last move / energy, and in this chapter he is stopping Big Mom again with something