NO.
First mistake, it isn't bout Zoro, the plot it's about "SAMURAIS+NINJA+MINKS+PIRATES where they have to revenge someones death+ the will of Luffy to defeat al the Yonkos."
Zoro is a mix between Pirate and Samurai, so yeah, it's an arc where zoro has 2 focus, but it's definetly not zoro's arc.
That's the same as sayin TB was zoro's arc because of Ryuma.
And nope, it wasn't.
Whole Cake was a RESCUE arc, where they had to rescue Sanji. That's what a Character's Arc means, where the plot is character-linked .
Wano plot isn't character-linked with Zoro (FOR THE MOMENT), Zoro is linked with Wano because of Samurais, but not with the plot, so IT'S NOT ZORO'S ARC.