Remember Yamato rushed to the roof because when she heard Luffy is fighting Kaido 1 vs 1 she thought he would need support.
Now would Luffy's first crewmate also distrust his ability to win against Kaido after Luffy asked both him and Law to leave Kaido to him ?
Or will he take on Kaido's top man, and when King teases him about Luffy standing no chance against Kaido in a 1 vs 1, Zoro will instead show full trust and demand of King not to underestimate his captain