When Enma was first revealed, i had also started considering Zoro cutting Kaidou a possibility, given i believed Enma to be a sword that can allow users who are yet not on a lvl bt with putting all Haki in one attack, might be able to damage Kaidou.
Bt since that didn't turn out true, i dont think Zoro will cut Kaidou. He is simply not at that lvl to achieve that, it is a feat Oden achieved who was atleast a Low Top tier, and Zoro he has to be prove to be even amongst the Strongest High tiers.
Zoro is being set up for Orochii, he has his plot revolved arround Orochii, Oda has directly had Zoro say he would fight/cut Orochii, so that's what he is gonna do. Orochii killed Yasu, who had connection to Zoro and he also showed extreme emotions for the same, witnessed the cruel state of Ebisu Town people who again is the doing of Orochii.
In Favour,
Only thing right now i think is supporting Zoro cutting Kaidou, is the fact that Kaidou came back immediately after Oden cut him. So even if Zoro cuts Kaidou, it wouldn't take away from Luffy fight and that is good thing since Kaidou is opponent reserved for Luffy.
If that is the case, Oda can allow Zoro to have yet another big Swordman feat that only Oden has achieved in Onepiece history.
I know that is power level inconsistentency since Zoro ain't at that lvl, bt again Does Oda really care about that as much as we fans? No.