This is why ive said in repeat that recycling villains for Zoro make no sense. Plot wise, sure, he can hold him off, but its clear to me that something will shift and they'll stop fighting in the end.
Luffy already mopped the floor with Lucci so to speak, and not 15 chapters ago were they fighting side by side against Seraphim. You also have Lucci's cover story, which already paints him in a protagonist role.
I would wait and see what Saturn ends up doing, but I can almost see Lucci switching sides properly. It just depends on what ends up happening.
As for a true Zoro fight, this is why I say dont sleep on the VAs. Sure, some of them seem goofy (at least the 2 this chapter), but so far Oda hasnt really touched on 3 of them that could very well be more interesting than initially thought.
Kizaru is probably still Luffy's fight until the end, and Saturn still feels like a deeper threat to the arc itself, not necessarily anyone's particular fight.