Depends how leveled your tier system is, Zoro and Yamato have no chance to beat Kaido whatsoever and wouldn't be more of a high-mid diff for him to beat them, so I don't see how putting them in the same tier makes much sense.
Yamato makes the big distinction between herself and Luffy clear.
Yeah, prolly mutliple CoC strength levels inbetween the absolute strongest guys and established high high tiers.
Since Luffy had an equal clash with Katakuri its been two decent power ups and multiple knock outs from which he learned a lot, but just assuming all this led to atleast one CoC growth up until now, which prolly kicked in fully, when he turned back to the Rooftop in 1023 (?), he has noteworthy more powerful CoC than Yamato, while he additionally can put it into juicy internal destruction haki blasts, whereas she relies on blunt force enhancement.
Hyogoro wanted teach Luffy the same haki swordsmen use to cut steel but Luffy unlocked an advanced version of that. Zoro never displayed it. what's so hard to understand here. and what does better haki mean? armament has many applications.
U will get what u want when the final battle happen, and i think BB will join force with akainu marine. The battle will be epic, Yonko army + marine vs luffy with his grand fleet.
Bb+akainu vs luffy EoS. Best war everrrr
Luffy's adv CoC was more believable than the bullshit he pulled with Enma, he actually understood the concept and is a haki master with a CoC speciality, is a known combat genius and had been knocked out twice by it before learning it.
Zoro just had Enma training wheels unlock it for him.
That was drunk Kaido using adv CoC that Luffy had never experienced before, while being completely immune to his damage due to lack of ryuo.
Also Luffy's powerlevel has always been dependent on mindset eg. first loss to base Lucci; getting clowned by weak characters when not serious etc.
Who's Who is weaker than Queen, yes.
Yet Jinbe defeated him mid difficulty, clean without distraction, without power up, and without water.
Queen is stronger than Who's who, but Sanji won only thanks to power up (he died without it when Queen slashed him), thanks to Queen attacked himself (he died squeezed by Queen if Queen didn't accidentally attacked himself and free Sanji), thanks to distraction. Well, without PU, his weak ass attack won't be enough to KO Queen.
So, difficulty matters. The formula stays as usual: Jinbe > Sanji.
No way Sanji already surpassing the guy who immune to Soul Pocus and the guy who almost sinked Big Mom to death.
Because one uses blades - cutting attacks -, while the other uses blunt force damage.
Kaido gets more or less significantly damaged only with either blunt force damage + internal destro CoA/CoC or CoA/CoC infused blades.