Your recency bias is gonna catch up to you, and then you're gonna switch up like it was obvious all along
Oda hasn't given any portrayal to Xebec that shows he's > Shanks or Mihawk
The things Xebec has done, doesn't show that other characters in this era couldn't do it. It's cool for example that he was the first to make it to the flower room, and he offed and admiral in his escape, but then you have the gorosei apparently scared of if shanks goes all out, despite having their Lord Imu.
I think Shanks and Mihawk could do the same thing, same with destroying the gate of justice. Just because they literally don't have the same feats as Xebec doesn't mean they're obviously incapable of them.
The thing you should be worried about as a Xebec Wanker, is that he's not yet been portrayed yet to have haki relative to Joyboy 1, and 2 he does not have a black blade that puts his swordsmanship on another level compared to anyone else when it was his era.
2 things he he obviously doesn't have until further notice, that Shanks and Mihawk do.
But who knows maybe he'll forge a black blade before he dies right now vs imu and show off his joyboy level haki
If not you're in trouble.
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Mihawk as well represents the "Dragon" that must be slain and overcome, similar to the feat that Oda chose to specifically show us about Ryuuma, although we learn he has many different stories that make up his legend.
Dracule can mean "Son of the Dragon" and so in essence zoro is the son of Ryuuma and Mihawk is the son of the dragon that ryuuma killed in a narrative sense.
The Dragon in a narrative sense is a term used to describe the big obstacle a character must overcome. Slaying the Dragon for Zoro is defeating Mihawk.
Because this will be Zoro's biggest challenge up to that point in his life, you can look at everything he's had to endure as build up to Mihawk's portrayal. Rather than Mihawk getting the Zoro variation treatment as you said.
He is a character another zoro-variaton, the child of fate Shanks couldn't actually overcome. Because he's the MC in this instance, him not being able to beat Mihawk is more of a failure than Mihawk not killing him for example.