Let's see Zoro low diffed Killer at his full power or even got powered up because he got superior weapon from Wano and had Haki blooming in Kaido battle. Where as Zoro was massively nerfed missing his strongest weapon and complete fighting style. And Killer is a YC4 level character easily so that shows Zoro at his full potential can low diff a YC4 level character.
Now if Zoro at his full potential can low diff a YC4 level character that makes Pica YC3 level which Pica by his feats is at least YC3 level anyways considering his feats make Cracker look like absolute trash. So Dressrosa Zoro can mid diff a YC3 level character.
That makes Dressrosa Zoro a YC1 level character. Which again makes sense as while brutally injured and missing his strongest weapon he can fight on par with Denjiro who is easily YC2 level character. Sure Zoro was huffing and puffing but that's due to his injury, take injury away and 2 sword Zoro ~ YC2 level denjiro. So once again 3 sword Zoro who is >> 2 sword Zoro is YC1 level character.
Then Zoro got Enma power up which gives him AP and Haki boost which makes him eclipse every YC1 level character. Which would be evident by the fact that he would defeat King in a high diff battle same way he defeated Kaku. I am almost certain of that.
Issue is not that Zoro doesn't have feats, issue is you have a preconceived notion that Luffu at all times has to be stronger than Zoro when truth is there is absolutely nothing in manga suggesting that notion. That notion is what makes you make a ridiculous statement like "All of Zoros opponents are fodders".
Even Zoros minor opponent like that Punk Hazard Dragon is easily Veteran level character and likes of Monet and Hyozou are easily comparable to likes of Amande..
Hell Zoro looked good even against a top tier.
@Fujishiro