The gap between Luffy and Zoro is big
Zoro vs Sanji is an extreme diff
Zoro vs Luffy is a low diff/lower end of mid diff
To be honest after wano with Zoro having adv CoC, I put the gap not to much large but I was wrong. And it make sense...
Kaido is at least Mihawk lvl, someone who will Zoro face in EoS, Luffy defeated this one(even with help thought), Luffy at least on that lvl right now. Zoro not and that is what it make clear.
Both faced the same opponent this arc.
While Luffy low diffed Lucci in few minutes without adv CoC, Zoro is struggle after 30min+ fight....
Even if we don't count that both didn't used adv CoC, Luffy holding back adv CoC has a more weight as what Zoro hold back since Luffy adv CoC is>>Zoro's one...
And Luffy low diffing Lucci without adv CoC while Zoro at least needs a high diff means the gap is bigger then I thought...
I was totally wrong after the portrayal which Zoro got in wano.