The dragon ryuma killed is not what made him legendary.
The dragon that ryuma defeated to create his legend was the gandhi celestial dragon.
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Zoro will never be at the same level as luffy ever again (they were equal until kuma separated them).
Oda wants to portray luffy as better than the typical MC. If luffy didn't exist, Zoro would be the main character. But Zoro met luffy, the only person who is destined to surpass him. That's part of why Zoro follows luffy
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Luffy will be the strongest in the world by the end of the series.
Luffy dying would be very anticlimatic and boring.
Big Mom defeating by the hands of Luffy makes way more sense
Zoro Kid Law and Luffy are comparable
Zoro, Law, kid and Sanji are comparable with Zoro being tge strongest. Luffy is a notch above Zoro