ah ok, I see your point now (and agenda
)
AdCOC is a powerful tool and haki overall can make you the strongest of the world (aka Roger and Garp).
Zoro can be stronger than them but having adCOC doesn't make it an immediate victory for him. Or an easy diff.
There are other stats or things that matter.
Law insane DF hax and how impressive he was against BM (a Yonko)
Kid offense, insane durability, and also his feats against BM.
It's like with COC.
Doflamingo is likely weaker than king or marco even if they haven't COC themselves.
But i truely think that COC in the end is the strongest power and you can't become the strongest without it.
And about DF vs haki : we are seeing just before out eyes that a very special DF while awaken can really compete with the best of the best.
Lets say Kaido and Luffy have the same haki level : Luffy will edge it out thanks to his DF powers.
So DF didn't became useless just like that.
I think Zoro vs Kid vs Law is really an open debate