Recall that Zoro is being setup to surpass not match Oden.
Not necessarily, especially in this arc. If you're referring to Zoro's skill to form the black blade, remember that the process of forming a black blade is unknown, but implied by Ryuma's legend that it only happened to him after countless battles, and Zoro doesn't have Enma for long, so not only it's unclear if he would have enough battles with Enma to do it in one fight, but it might happen that he just completes the battle cycle to form the black blade that may have started from the multiple years Oden had been fighting with it
And if you're referring to scarring Kaido or more, remember that Oden could have beaten Kaido on his own if not for the hostage thing. On the other hand, there are multiple people fighting Kaido now, so whatever feat Zoro would accomplish wouldn't be comparable to soloing Kaido(especially since Oden was the one fighting at a number disadvantage) , especially with Oda who is yet to show any difference between current Kaido and Kaido from 20years ago(current Kaido believed the entire Scabbards were nothing compared to Oden, who he believed could still kill him)
Furthermore, in Kaido's mind, killing him > Scarring him > Opening old scar > Wounding him, with Oden having the feat of scarring him and him believing that Oden could actually kill him, so with Kaido thinking the Scabbards can't even open the old scar, it could depend on if Oda simply aims at Zoro simply accomplishing that feat to show his potential or something more(creating a new scar)
And thus for these reasons then, Zoro may not necessarily manage to match let alone surpass Oden this arc. Hell I believe that even for Luffy, it's debatable. Oda could simply use the foreshadow of Zoro with Enma to show Zoro's future potential, that he'd one day surpass Oden, but not necessarily this arc.
By the way, I think you should have given more options to your poll since while I believe Luffy will outshine everyone, I also believe it's debatable with Kid, but will clearly outshine the rest