You don't tell your equal to take you out if you turn evil and lose control
You don't tell "I am looking forward It" when you are facing someone supposed to be stronger.
So Zoro > Sanji > King.
Luffy Is Joyboy, how can you still compare Zoro to him?
Zoro fought alongside him in a fight against Yonkos which was not A MAIN fight.
Sanji was alongside Zoro MAIN fight.
Luffy defeats a Yonko.
Zoro just defeats the strongest Commander and Sanji the other Commander.
Yonko >>>> strongest Commander > other Commander.
You can wank King as much as you Wish, he's still a Commander so logically wise he's gonna be more near to an other Commander than to Kaido.
And I already explained the INSANE and Huge Gap between Zoro and Luffy.