With the way the manga is going, and how the whole cake is shaping up. It seems like there could be a war from multiple sides, besides the obvious opponents(Big Mom, Vinsmokes, etc.). There's one person who also was seen making plans for their future.
This man is Capone of course who we know joined under big mom marrying one of her daughters. Now last time we saw him he shot pekoms, and threw him in the icing sea or whatever it was. Since then he's been laying low planning something.
Personally I think he's either gained allies among the lower levels of big mom's crew. There's no way him and his crew have the power to fight big mom's pirates, and the Vinsmokes. So second option he's waiting for the perfect opportunity, and with part of big mom's army accompanied by some of her bigger names in one place. With the Prometheus Zeus reveal and nami having the viva card of big mom. If she did attack and was able to distract or even take out a good number of that army, it good give Capone the perfect time to reveal his plan. Sorry this was so long but I just wanted to know what you guys think. Will Capone move anytime soon or does he wait until things really reach a near climax?