WCI Luffy strength and speed It's not similar to Wano war Luffy. Luffy spend time in the prison improving his base stats and FS.
Kaido didn't grow stronger during the war. He just used FS and completely put Luffy's snakeman and FS to shame.
Zoro tanked hakai that hit his entire body. Not just head.
I can see you're still upset Katakuri lost to Caesar and oven. Two veteran level fighters. Don't be upset because he's the weakest YC1.
Luffy's training was armament. He said he wanted to penetrate Kaido's scale. Not to be faster to Hyou.
Post Udon Luffy got blitzed by Thunder Bagua chapter 1042. Luffy's speed was consistent. Or do you have panels of Luffy training his speed in Udon? Panels of Luffy training only shows his armament training.
Kaido had to get stronger by using FS and copying Snakeman speed to keep up with Katakuri's speed level Snakeman. Afterward, Kaido did not us Future Sight again and copy Snakeman speed since he was not in Thief mode. Kaido was at his strongest when he was fighting Snakeman speed level Katakuri since that Kaido was using FS and copying Snakeman speed. Kaido was weaker when he was fighting Nika Luffy (non Bajrang Gun).
The point remains though? He only used Future Sight and copied Snakeman movement only when he was fighting Snakeman Luffy. He did not use FS or copy Snakeman movement when he was fighting Zoro. Zoro was viewed beneath Snakeman that extreme diffed Katakuri since Kaido did not need to use FS or Snakeman. Kaido even did not use Thunder Bagua against Ashura because plot prevented him. Thunder Bagua blitzes Ashura and knocks him out.
In term of power level,
Kaido who was fighting Bajrang Gun Nika Luffy>Kaido who was fighting Snakeman (FS+copying Snakeman movement)>Kaido who was fighting Nika Luffy without Bajrang Gun.
Katakuri also put Snakeman Luffy to shame that does not mean Katakuri was as fast as Snakeman. Same with Kaido's case here. Moreover Snakeman Luffy did not use his faster attacks like King Cobra and Black Mamba. Kaido who had to get stronger by using FS and copying Snakeman movement was as fast as Snakeman Luffy.
It seems like you are gnoring my rebuttal to your "Zoro tanked TB" that Zoro took TB that hit his body. TB to the head kills him. I also already showed with example that Kaido hit to Oden's head knocked him out while Oden withstood Kamusari that hit his body. Zoro blocked Hakai. he never tanked it fully. Surviving a car crash does not mean you can tank an attack from Mike Tyson. Zoro remains a glass canon unless he shows feat tanking physical yonko attack to the head not to his body.
Losing to Yeti Cool brothers, Caesar errand boys and got hurt by gifters are more embarrassing.
None of Katakuri's worst feat is worse than Zoro's worst feat.
TB still blitzes and 1 shots current Zoro. Kaido did not need to get stronger by using FS and copying Snakeman movement.
Do you think Kaido had to get stronger by using FS and Snakeman speed to 1 shot Zoro or King? Judging from Snakeman vs Kaido it's obvious that Kaido had to get stronger by using FS and copying Snakeman speed to beat Katakuri but he does not need that to 1 shot current Zoro or King.