i think Zoro is more of a lone wolf character, not a leading one. He would rather fight his way through the world alone, when there wouldn’t be Luffy.
kid on the other hand is extremely close to his crew, like Luffy is, remember when the whole crew adapted killers laugh to make him suffer less. Do you think zoro would join? I kinda doubt.
and yeah, give me your reasoning. But it wasn’t meant to you personally, just got countless mentionings from zoro fandom, all try to troll and provocate me for that. Which is, honestly, kinda stupid.