Zoro haters better hope that's not the case.
Luffy defeats Kaido but he can't move anymore -> Kaido awakens, out of his mind, on a rampage -> Zoro kills the dragon above the flower capital -> It doesn't undermine Luffy because it wasn't a conscious Kaido, Luffy defeated the "real" Kaido -> Zoro's feat is still incredible because the dragon scales are hard to get through, as seen when he used Asura and when Oden fought Kaido
Luffy gets his Yonko moment
Zoro gets his legendary samurai moment
:cheers: