What is "fully mastering Conqueror's Haki" to Zoro to begin with?
We don't know certain things about his capability with it.
1. Does he carry the disposition of a king properly?
- This is debatable
2. Will he be able to knock out thousands of people, and, if so, how many?
3. Will Zoro perform a sky-split? This is trademark of a proper conqueror.
4. Is it possible the extent of Conqueror's Haki usage for Zoro is different than with people like Roger, Shanks, Luffy, Whitebeard, etc?
5. If, supposedly, Mihawk uses Conqueror's Haki, why hasn't he demonstrated a Conqueror clash before?
I'm starting to think whatever Zoro might do with Conqueror's Haki, it's not the same as what other people will do with it. For example, Wi-Fi diffing someone? That might be exclusive to people like Shanks instead. Maybe Zoro's Conqueror's usage will apply to his swordsmanship, but outside of that who knows?
We have certain reasoning problems to address, too. For example, we think Rayleigh has "fully mastered every form of Haki", but has he actually? He's never wifi-diffed someone. Sure, he charged his Haki here and there and sent it flying a little, but that's not the same. When Shanks did it, he went over what seemed to be an extra long distance and then took out an Admiral. Can Rayleigh do that? I'm not sure, and this is who you're comparing Zoro with, right? Rayleigh lol
Rayleigh is cool and all, but I don't think he was half as talented at it as Roger was or even Shanks is now.