The idea is what happened afterwards
He entrusted Kaido to Luffy
This is like every colloseum fighter wanting to beat Doffy by himself and all announced that…
But at the very end, they all entrusted it to Luffy…
Here Zoro wanted to get a taste of Kaido’s toughness… at the very end, he went to lower levels… and told Sanji specifically that Luffy will handle Kaido and will defeat him
he entrusted it to Luffy… while he decided to be useful with King…
Kinemon also announced he will behead Kaido before the raid, does that make it a guarantee!?
Kinemon after they lost with scabbard decided to be more useful somewhere else and leave Kaido to Luffy
it is Luffy… and Luffy alone to finish Kaido