Timeline
In round One, Marco & King clash in midair as he's taking Zoro to the top.
Zoro meets up with Luffy, Xdrake, Jinbie, Kidd, and Killer.
They fight Kaidou and get stomped. Zoro's Sandai is broken by Kaidou.
In round Two, Zoro ends up fight King and barely wins. During this round, Hitetsu gives Nidai to Zoro.
In round Three, Zoro encounters Kaidou. This time, Zoro is victorious.
Alternate Timeline
In round One, Zoro fights King, his sandai breaks.
In round two, Zoro obtains the Nidai from Gyukimaru and continues to fight King until he wins.
In round 3, Zoro finally encounters Kaidou and strikes Kaidou down.
In round One, Marco & King clash in midair as he's taking Zoro to the top.
Zoro meets up with Luffy, Xdrake, Jinbie, Kidd, and Killer.
They fight Kaidou and get stomped. Zoro's Sandai is broken by Kaidou.
In round Two, Zoro ends up fight King and barely wins. During this round, Hitetsu gives Nidai to Zoro.
In round Three, Zoro encounters Kaidou. This time, Zoro is victorious.
Alternate Timeline
In round One, Zoro fights King, his sandai breaks.
In round two, Zoro obtains the Nidai from Gyukimaru and continues to fight King until he wins.
In round 3, Zoro finally encounters Kaidou and strikes Kaidou down.