1. What the fuck are you talking ?
Marco and Drake're part of the war now, how it would be wrong for Marco to deal with King and Drake (with Sanji) against Queen. Marco says it himself that their first role is to beat Kaido, so stop messing around with your shitty calamities especially since Queen seems interested in Sanji and Drake (because he's a traitor) for King and Marco it's written because the two people look alike (They turned down an offer of a yonko, they had the same scene with the Big Mom crew and they have an identical DF)
For Zoro Oda shows us very well that he absolutely wants to face Kaido, generally Zoro shows no interest in the final boss and always fights against the right arm but here he doesn't care, you have to be really blind not to see that, use your eyes once
2. You are Oda, you know how the fight will go ? If Zoro does a good performance against Kaido and manages to hurt him on top of that (big injury) that's more than enough, You tell me that he will not fight against any samurai but we have never seen a single calamity used a fucking sword
Especially since Zoro seems to be involved in what is he's happening on the island (Hiyori, Yasui) it's just completely normal to see him fighting Kaido, so stop saying shit and open your eyes, their fight has been tease for a long time, you came late