So I’ve been building a theory:
Initially we’ll get Dorry and Broggy vs Zoro and Sanji. Zoro will be doing the heavy lifting, being able to damage Dorry while Broggy will battle Sanji. Sanji will use Ifrit Jambe and the his exo mode to battle Broggy to no avail with Broggy regenerating every instance of damage. Broggy will send Sanji flying with an attack. Sanji will get up but finds himself surrounded by the majin Giant Warrior Pirates. As Zoro is being double-teamed by both Dorry and Broggy he’ll start to lose ground. Suddenly an ear piercing scream from Sanji distracts Zoro, causing him to be distracted as both Dorry and Broggy use a combined attack to hit Zoro. Zoro is wounded but remains standing. Suddenly Sanji appears but he’s different; he’s been domi’ed however his appearance is slightly different. He maintains his normal mode but his eyes are pupiless with a grim visage and his hair has turned black. He resembles his Germa mode in stealth black but with black hair. Zoro seeing the situation is dire uses KoH Asura to take out Dorry and Broggy who lose their dominant arms each. Zoro apologises to them. Zoro proceeds to try to reason with Sanji , but Sanji kicks with Zoro noting that his speed has increased tenfold. Sanji activates ifrit jambe but the flames are black now instead of blue and hits Zoro with Majin Jambe: Veau Shot. The impact breaks Zoro’s rib and sends him flying away. Sanji then proceeds to attack all the giants, including Ripley. But Franky steps in. Franky chastises Sanji for attacking a woman, but Sanji ignores him and proceeds to attack. Sanji is moving so fast the Franky can’t even hear him let alone glimpse him. Usopp activates his observation Haki, noting that Sanji is moving so fast that he can only catch glimpses. He then warns Franky, but it’s too late, Sanji kicks Franky shattering his arm. As Sanji picks up Franky ready to kill him, Zoro shows up and attacks Sanji.
We then get Zoro and Majin Sanji fighting for the Zoro using KoH mode whilst Sanji is using his Exo + Majin mode. Zoro tries to talk sense into him, but Sanji is emotionless. We get a flashback to Zoro and Sanji’s interaction on Onigashima. Sanji kicks Zoro away and approaches Zoro to finish him off, Nami then shouts at Sanji, with Sanji’s attention turning to her. Sanji ominously approaches her lighting his leg on fire. Sommers begins laughing calling the scene a tragic comedy. As Sanji is about to attack, Zoro comes and slices Sanji across the chest. Sanji falls to one knee and coughs up blood. Zoro steels himself and prepares to finish Sanji off. The Strawhats beg Zoro, not to do it. We get an emotional scene where Zoro tells Sanji he’ll uphold his promise, but ends up breaking down at the last minute telling him he can’t do it. Zoro yells at Sanji calling him a burden in a mirror of Egghead, saying that Luffy won’t become Pirate King without him. In a moment of realisation, Sanji breaks through the mind control and unlocks Conqueror’s haki by focussing on the love of his crew, breaking free from Imu’s influence. We get a scene where Sanji’s CoC unleashing a wave. Sanji’s transformation begins to revert but weirdly he still retains his black hair and eyebrow swirl. Sanji gets up and apologises to the crew telling Zoro he didn’t keep his promise. Zoro calls him a burden and says that he should have killed him. We get a flashback to what Gaban said to Sanji. Gaban says that Sanji cannot be a conqueror, until he conquers his inner conflict first. Gaban says that a conqueror is one who is free of burden/self conflict only then can you dominate others. Gaban says that Imu’s powers work by inciting that single kernel of self conflict and doubt to bring about the evil from one’s heart. Only a true conqueror, can remain unaffected by his influence.
