Just imagine... Kid is going to fight a giant, f.e. Loki, on Elbaf. To fight him, he builds up a giant mech, like Punk Rotten was the base of it. So a giant mech in front of Loki. And while Loki pulls his weapon, his scepter with a huge blade on its top, Kid (in form of his mecha), rises an arm, opens the hand, stretch it away from him and there is a huge "+" in his palm, which suddenly starts to glow.
Then we get a scene-switch, some strawhat stuff, then some Law stuff in some panels, then a switch to Wano. In Wano the people are celebrating their new freedom, are building their new society, enjoying each other, but suddenly a big rumbling. Momo and Yamato going for the source of the rumbling, they are scared since it comes from Onigashima. Are Kaido or/and Big Mum still alive and crawling back to wano? When they get closer to Onigashima, they see... neither of them it is. The giant sword of Onigashima is suddenly rising on its own and caused the rumbling. It has a huge glowing "-" on its grip and before they can get closer to inspect whats going on, it flies in an extreme speed away from Wano Kuni. Leaving both of them hugely shocked.