This is one possible way I see the future arcs of the series going-
I think the alliance will be outmatched in Wano. And when things look hopeless, suddenly the Blackbeard pirates will arrive. Aokiji will fight Kaido with an Advanced COA imbued Ice Saber and advanced coa imbued partisans and will kill him, while Blackbeard will fight and kill Big Mom. They will then leave Wano and the heroes won’t really be able to do anything.
Yamato and Carrot will both join the straw hats after this
Then the straw hats will learn about Sani’s capture and possible execution. They will try and rescue Sabo and in the process come into contact with Fuji and GB, maybe near impel down. Luffy will fight and beat GB while Zoro will fight and beat Fuji. But they fail to rescue Sabo who will be sent to Marineford 2.0.
While the rest of the crew go to save Sabo, Zoro will leave on his own because he thinks he is now ready to beat Mihawk.
Marineford 2.0 will happen. The Straw Hat Grand Fleet will go to war with the marines. Luffy will beat Akainu and get payback for Ace. Sanji will beat Kizaru. Yamato will beat Tokikake. Jinbei will beat Gion underwater. They will successfully save Sabo. The rest of the straw hats will probably be involved with this.
In the meantime Zoro will duel Mihawk and defeat him becoming the WSS.
After saving Sabo, the Straw Hats might or not find One Piece before the final battle with the BB pirates.
The final battle will happen. Luffy will beat BB, Zoro will beat Aokiji, Sanji will beat Shilliew, etc.
In the final chapter Luffy will give his straw hat to Shanks and Makino’s daughter/son. It’s possible Shanks might have died but honestly I’m not sure.
I think the alliance will be outmatched in Wano. And when things look hopeless, suddenly the Blackbeard pirates will arrive. Aokiji will fight Kaido with an Advanced COA imbued Ice Saber and advanced coa imbued partisans and will kill him, while Blackbeard will fight and kill Big Mom. They will then leave Wano and the heroes won’t really be able to do anything.
Yamato and Carrot will both join the straw hats after this
Then the straw hats will learn about Sani’s capture and possible execution. They will try and rescue Sabo and in the process come into contact with Fuji and GB, maybe near impel down. Luffy will fight and beat GB while Zoro will fight and beat Fuji. But they fail to rescue Sabo who will be sent to Marineford 2.0.
While the rest of the crew go to save Sabo, Zoro will leave on his own because he thinks he is now ready to beat Mihawk.
Marineford 2.0 will happen. The Straw Hat Grand Fleet will go to war with the marines. Luffy will beat Akainu and get payback for Ace. Sanji will beat Kizaru. Yamato will beat Tokikake. Jinbei will beat Gion underwater. They will successfully save Sabo. The rest of the straw hats will probably be involved with this.
In the meantime Zoro will duel Mihawk and defeat him becoming the WSS.
After saving Sabo, the Straw Hats might or not find One Piece before the final battle with the BB pirates.
The final battle will happen. Luffy will beat BB, Zoro will beat Aokiji, Sanji will beat Shilliew, etc.
In the final chapter Luffy will give his straw hat to Shanks and Makino’s daughter/son. It’s possible Shanks might have died but honestly I’m not sure.