1. Egghead offers a conclusion to a 600 chapter storyline. Bonney and Kuma's story arc coming to an end.
2. Saturn was built up as a hateable villain who literally caused all of Bonney's problems and many of Kuma's.
3. Bonney and Kuma put their hopes in Nika.
There is absolutely 0 way Bonney and Kuma can have their arc completed without Saturn losing. Saturn was the one who killed Ginny after all and gave Bonney the disease. Meaning for their to be closure. Saturn has to fall.
It simply makes 0 sense for Saturn to lose later 300 chapters from now
It's not impactful storytelling wise. And it makes 0 sense to drag out Kuma and Bonney's resolution for 2 to 4 hundred chapters.
Completely agree including with those reasons and some others too.
This also helps to assert that the SHs will come out victorious too:
They've just become a Yonko crew truly now post Wano, Luffy was declared an emperor prematurely after WCI by Fake News Morgans but he's truly earned it now post Wano and he's gonna make the WG, The Marines and thus the world see why he's this generation's Whitebeard as well as Roger ofc l, why he's a Yonko now and thus the inevitable next future Pirate King soon too.