Okay this is a pretty baseless theory but these are my thoughts:
Act 3 will end after Zoro finally meets Kaido.
Oda has been saving their encounter for a reason, every single time Kaido has an encounter with one of our side, Zoro somehow misses it. Their meeting will be huge.
It isn't just going to end the Act, it's going to trigger a memory within Zoro.
Zoro was 3 years old 18 years ago when Ringo was destroyed and Shimotsuki Ushimaru is killed.
Seeing Kaido will trigger the memories of Ringo's destruction that Zoro witnessed as a baby.
This will serve as motivation for Zoro in the fight against Kaido.
Act 3 will end after Zoro finally meets Kaido.
Oda has been saving their encounter for a reason, every single time Kaido has an encounter with one of our side, Zoro somehow misses it. Their meeting will be huge.
It isn't just going to end the Act, it's going to trigger a memory within Zoro.
Zoro was 3 years old 18 years ago when Ringo was destroyed and Shimotsuki Ushimaru is killed.
Seeing Kaido will trigger the memories of Ringo's destruction that Zoro witnessed as a baby.
This will serve as motivation for Zoro in the fight against Kaido.