Zoro is fighting King. Marco will go help Luffy.

So Marco, Yamato, Momo and Luffy vs Kaido.

Eventually it will be Luffy vs Kaido which means the other 3 will be defeated.

Meaning Kaido will beat admiral level Marco (According to Deep Blue databook) in a 1v4 :steef:
Marco will probably use a stronger or proper hybrid form too vs Kaido which he never showed vs Admirals.
 
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