As we know each new arc we get has a theme or is centred around one of the members of the Straw Hat crew in some way or another. In Whole Cake Island we had the Sanji arc and now in the Wano arc it will most likely be centred around Zoro, and I’m assuming Oda will give Zoro a good few strong opponents to do battle with.
So how this would come about is, for a past few chapters now we have been made aware that Jack the Drought survived and is currently in Wano at the moment. Now with Luffy knocking out Holdem, Jack is apparently going to go on a rampage and look for Luffy.
Meanwhile we see Zoro going on one of his walk abouts again and as usual he is going to get lost and into trouble as he always does (eg. Like when he almost sliced up a Celestial Dragon on Sabaody Archipelago or two years later accidentally getting on the wrong ship bound for Fishman Island), now this time around it is going to lead him directly to Jack either by walking into him directly or by having one of Jack’s subordinates see him and reporting it to Jack.
Now with Jack’s status as a Calamity and being one of the 3 Top fighters in the Beast Pirates, his Bounty of 1 Billion is nothing to laugh at and it will definitely be a tough fight for Zoro to handle at first, then we will have a little bit of a flashback of Zoro’s training with Mihawk, and Zoro unleashing his new techniques he has been honing for the past two years.
After the fight with Zoro being the winner and eventually being found by one of the Straw Hat crew or even someone from the Alliance, Zoro will have a bit of a rest to regain his strength so he might not be seen for a few chapters, while the rest of the crew and Alliance face off against the Beast Pirates and the Shogun’s forces.
Now once Zoro has regained stamina, Zoro will move onto his next big fight which will be against the Shogun Kurozumi Orochi. Orochi uses a sword-style known as “Orochi Two-Place Style” so that could mean he is very proficient in Nitoryu (Two swords) techniques, but where I’m taking my theory comes from a few other panels in the chapter itself and that is where Kishiro Inemuri is talking about how Oden’s wife spoke about “The moonlight will cast 9 shadows across the moonlit nights”
Now this to me had two meanings: 1. There are 9 Straw Hat members currently in Wano (not including Jimbei as he hasn’t been seen yet). 2. Zoro can use Asura to create 6 more swords added to his 3 using 9 swords.
These are the two big fights I’m predicting at the moment, he might face off against one of the Headliners as well but they’ll pale in comparison to these two, as Oda stated this war will be the biggest yet, and I’m sure a lot of the Straw Hats will get a few fights in with major players in the Beast Pirates and the Shogun’s Forces.
*Theory by ZeroDark