Let me sum up the arguments
Arguments by Z Bois
Kaido looking for samurai like Oden (Luffy is not that samurai for sure)Arguments by Z Bois
Ryuma legacy and parallels cutting dragon with one hand sword (Zoro also fired slash at Kaido with one hand which kaido dodged)
Foreshadowing - Kaido feels Killing himself is difficult, taking Kaido's head talk between Zoro and Samurais and Zoro wanted to cut him into pieces (not defeat him)
Emma
Zoro's past links with samurais
Counter Arguments
1)He is Luffy's opponent
2)Zoro has done enough
3) Delusional Zoro fans and their stupid wank
Oda confirm that Zoro is: high class samurai
We get the confirmation that a single swing is enough to slaye a dragon
Oda coudnt be more clear about Zoro being a shimotzuki (Oda is pushing further the Zoro&Ryuma bond):
Sure this chapter is the end for ZKK :laughmoji: