Facts its basically already confirmed
Kaido: I don’t know from where, but Yamato has brought up the name Joy Boy…
King: !
Kaido: “Opening the border of this nation”…looks like Oden’s wish was a preparation for Joy Boy…
If it’s the same person as who you’re waiting for..then King, I know who Joy Boy is
King: ..? Who is it?
Kaido: the guy who can defeat me in the future
but then ill get up again and be really defeated by him, some guy with green hair, a metal head, a doctor, 1 of them members of daft punk, a t rex, a guy with piano teeth, and yugi motou!!!
kaido: the green hair guy landing the fishing blow and killing me