What I'm certain and I'll die on this hill is that the Egghead incident is about Nika defeating Saturn and liberating Kuma. Anyone who doesn't agree can't comprehend the recent chapters and/or is heavily blinded by their agenda. It's blatantly obvious where Oda is going with this.
Now, this certainty about Nika defeating Saturn implies the possibility that Zoro defeats Kizaru, why?
- Kizaru is certainly going to come back, Luffy one shot him but it's not over for him
- Zoro is the only one in Egghead capable of stopping Kizaru if he comes back (Luffy is going to get busy with Saturn)
- Nika mythical zoan vs Saturn mythical zoan, Zoro sword vs Kizaru sword, Sanji leg vs Lucci leg
- Zoro wants to cut everything, including light
- Zoro defeating Kizaru is going to get him a 3b bounty, while Luffy gets a 4.5b bounty for defeating Saturn (Zoro always gets a bounty that is 1 tier below Luffy's)
- Zoro getting a 3b bounty and defeating Kizaru is going to put him closer to Mihawk, while Luffy surpasses Shanks (4.5b bounty) and gives him the SH in Elbaf
Now, this certainty about Nika defeating Saturn implies the possibility that Zoro defeats Kizaru, why?
- Kizaru is certainly going to come back, Luffy one shot him but it's not over for him
- Zoro is the only one in Egghead capable of stopping Kizaru if he comes back (Luffy is going to get busy with Saturn)
- Nika mythical zoan vs Saturn mythical zoan, Zoro sword vs Kizaru sword, Sanji leg vs Lucci leg
- Zoro wants to cut everything, including light
- Zoro defeating Kizaru is going to get him a 3b bounty, while Luffy gets a 4.5b bounty for defeating Saturn (Zoro always gets a bounty that is 1 tier below Luffy's)
- Zoro getting a 3b bounty and defeating Kizaru is going to put him closer to Mihawk, while Luffy surpasses Shanks (4.5b bounty) and gives him the SH in Elbaf
Though I suppose if Oda opts to go the bleaker, more nihilistic route and have Kizaru double down on his current status, I can certainly see it being likely that Kizaru would fight and lose to Zoro.