I find it odd that at this time several groups start appearing near Egghead. They must have been called out by someone (probably York), like in the God Valley. And there must be a reason to take part in this battle. Maybe Vegapunk has some treasure or knowledge (perhaps of the Void Century) or something. But this incident will be really grand if so many factions get involved. Dragon also has a high chance of arriving because he was wondering where Kuma was headed. So we already have SH, BB's crew (maybe only part of it) and marines. As well as potentially a revolutionary army. And who knows who else has been informed of the upcoming event.
