Always thought the 'Baratie' arc laid everything out, even if it wasn't their main focus. Sanji serving the crew for the first time and Zoro lying there bleeding out, already putting his crew's safety over his pride—it established their contrasting but parallel codes. They're both insanely proud but in totally opposite ways. Sanji’s chivalry feels performative, like he needs someone to see it, while Zoro’s honor is this silent, brutal thing he only discusses with himself. You see the seeds of a rivalry built on mutual respect, not just annoyance. Later, 'Water 7' and 'Enies Lobby' force them into a weird sync. They’re fighting separately but for the same thing, and Zoro’s 'nothing happened' moment later feels like the ultimate extension of that silent honor Sanji still doesn't quite get.
The post-time skip stuff, especially Whole Cake Island and Wano, twists it. Sanji’s whole crisis of self-worth and heritage—Zoro’s the one who calls him out for running off, but he’s also the one who trusts Luffy to handle it. It’s less about them interacting directly and more about seeing how the other’s philosophy fills a gap. Sanji’s emotional, sacrificial streak versus Zoro’s ruthless pragmatism. Their best development isn’t in sweet moments; it’s in the arguments, the side-eyes, the unspoken agreement during a fight. The tension is the point.