I was going to make a thread on this too. I think there's definitely room to believe that Sanji & Zoro will finally have a fight here.
And the perfect setup is here & it will center around Nami. That's when Sanji goes death penalty mode. Literally every time it's always about Nami.
So the question is, what does that have to do with Zoro?
Imo, this island going to cause a lot of trickery & it will start as a misunderstanding involving Nami. Perhaps she's taken away, a captive, or in critical condition.
Sanji will be lead by emotions to either target someone or do something because of Nami but Zoro will know the real truth of the situation & it will be his job to stop Sanji from doing something stupid. But Sanji's emotions will be so high that he can't be reasoned with.
So in these scenarios, Sanji would be the aggressor.
I see it as a mixture of the ussop vs Luffy & Sanji vs Luffy fight.
Sanji is going all out, getting some clean hits in, showcasing his troubling speed. There would be memorable flashback moments of their promise, etc, Zoro trying to get Sanji to wake up, Sanji going absolutely ballistic but then Zoro locks in & puts him down.