I don't say that nobody dies in One Piece. Ace died, WB died. But now the message of killing Kaido is not something Oda would do, in my opinion.
All those panels are "fake death". Orochi is still alive.
I repeat, I am not saying that One Piece did not already show something dark like that but the thing is that the message will not be "Let's kill Kaido, he want to die anyway" but it's "Kaido want to die, Luffy will make him understand the beauty of living while he punch him to the ground of course".