There is nothing imaginary about it, it is Death itself. Zoro gonna win that fight himself, wont need Joyboy to resurrect his ass.
Joy Boy is Luffy. Your copium is over.
Momonosuke: "Joy Boy…!?
Do you mean Luffy!?"
Yamato: "Is that... what Zunesha said!!?"
Current Luffy is on worst stage than Zoro post 1 second hakai.
And he didn't need Oden's haki to harm Kaido like Zoro.