Welp after latest chapter, theories that 'Zoro only/and Luffy will be ones to damage Kaido' and 'Zoro will 'solo' and 'face' Kaido' have just been destroyed as we see Scabbards are ones who actually give him damage to his body and first ones. If it looking to be that Kaido get team by many angles, it wouldn't matter much on who dealt the attack on him since everyone are playing a role to take him down, so once again Zoro having Enma didn't mean he will 'beat' Kaido when that is imagination to begin with given Luffy always take priority in beating major antagonist himself always. Pretty sure Luffy will take majorly in blow and defeating Kaido even when teaming up, so we are getting glimpse more on how things could lead, but Zoro won't be in it as he will have his issues with facing Orochi (If turn out he is truly alive due to DF and get stronger than before), Kanjuro (If not a fake act again in being cut down), or T6H.
If he does face YC lvl opponent (Orochi and Kanjuro in this talk), he need a squad to help him out for that fight. Can't see him solo anyone that strong given his performance doesn't push he can handle someone by himself on his fights.