You do not really realize it, do you?
Luffy is also WB based on having "sake cup with sons", and based on Fishman island seeing WB in Luffy.
What people do not realize yet is that:
- Luffy is mirroring Roger, WB, Garp, Shanks, Dragon, Oden, Ace, AND student of Rayleigh.
- Zoro on other hand mirrors Ryuuma (which shouldn't be a disappointment when Ryuuma is being considered a GOD in Wano and being worhsipped, something Oden didn't even manage to do. It's just simply, Oden is being a reflection of Luffy in this arc, sure he got few similarities with Zoro, but Zoro got similarities with Luffy anyway, and Zoro got similarities with other characters who people wouldn't care to bring it up. The only reason Zoro brings the smallest similarity Oden-Zoro has is to enforce the agenda that Zoro will surpass Oden in this current arc which doesn't make sense because Prime Oden is being on Yonko level! Makes no sense whatsoever!
- Zoro mainly mirrors Ryuuma & Rayleigh. Zoro mirrors Rayleigh MORE than his similarity with Oden. Let's not forget tat Oden's soft spot with women is a similarity with Sanji. Zoro would NEVER give up his ambition for a woman screaming "kyah" on a far distant island, while Oden did it just like what Sanji would have done! So, Oden has similarities with Zoro and Sanji, BUT Oden is more of a reflection of Luffy, not Zoro nor Sanji.
- Lastly, in my book, Zoro being a mirror to Ryuuma is MORE HONORABLE and MORE REWARDING than being a reflection of Oden. Ryuuma was the STRONGEST Swordsman in his time, PROVEN FACT, while Oden is only being said by fans that he was strongest swordsman, which is not proven yet. Ryuuma is more appreciated by Citizens of Wano than Oden, basically being worshipped and called "Sword God". Ryuuma managed to turn his blade black, Something Oden didn't manage to do yet despite being a "pure swordsman". Ryuuma successfully Lead the people of Wano against the WG from their invasions 400 years ago, and defended Wano during the time Wano was called "City of Gold". And Until this day, Wano is being feared by the WG and Marines do not dare to step inside casually due to Ryuuma's name, NOT Oden.
So, when I say Oden is a reflection of Luffy, not Zoro. It's NOT that I try to take things away from Zoro. It's just oden's personality is Samurai Luffy as
@Jo_Ndule suggested. It's not trying to downplay Zoro, because Zoro already has BIGGER figure as a reflection with Wano's history, and that is Ryuuma himself who represents Wano to its core.
Also, the scabbard themselves, specially Asura Douji already saw Oden in Luffy. Luffy is the man who is making pacts and relationships with the scabbards more like Oden. While Zoro, I'm sorry to say, but he's just a vagabond.