We saw Killer cut and even blitz Kaido, but apparently he has a 92% chance of losing to Hawkins, who is definitely not commander level.
Also, Zoro was in a 5v1 while Marco was in a 1v1.
If you put Zoro in a 1v1 against an emperor, he loses. Very, very badly. The best he can probably do is stall for a bit like Marco or probably Katakuri. Hence he’s Yc1 level.