Kid lost a chance to kill Kaido on the rooftop. Even with awakening it wasn't enough to defeat or kill Big Mom. He needed Law Kaido's bombs doing majority of the work to defeat Big Mom.
Zoro is one of the three main characters of One Piece. Oda told us that a long time ago and nothing has changed.
Oda has been hinting at Zoro killing Kaido since Punk Hazard. This chapter shows more parallel and ties between them. Unfortunately, some choose to ignore it because they can't stand the idea of Zoro killing Kaido because it goes against their headcannon.