It will be a long post about 1043 and a few others chapters.
I will mainly talk about Joyboy
1) Luffy didn't die
First Kaido knocked out Luffy. He was unconscious but his body was still "working" as his Haki runs out (like it does when he can't use G4 anymore) after the blow
-After that Luffy deflated, flew and fall
You could argue that the fall was too much to support but Luffy is rubber even unconscious so the fall can't damage him
Voice vanishing : It didn't meant death
For example in Skypiea GanFall and Satori's voices vanished
GanFall came back a little after for the last fight against Ener
Aisa couldn't sense the voice of people which were KO but only the ones from Ener and Nami around the island
The silence SFX : He was used back in Impel Down when Luffy was poisoned by Magellan and tried to recover
Luffy was shouting, he stopped.
Ivankov thought Luffy died and just after he was back
You should applause Oda if he managed to makes you think Luffy died when you know he's the MC
2) Joyboy didn't took over Luffy's body
I mean this should be obvious for a reader.
Killing your MC and letting someone took over his body after 1043 chapter and before he accomplished his dream ?
It sounds really dumb, doesn't matter how you says it
We hear Luffy's heartbeat before the drums of liberation
So no Drums of Liberation aren't heartbeat but likely a sound which means that Wa No will be released soon
That's why we see them on several panels which doesn't even include Luffy
If they were heartbeat everyone should be able to heard it even people on Wa No mainland
3) Joyboy is a title
It's the title of the guy which will change the world
At first It was a name the name of the first guy which tried to change the world and it became a title
We have the same thing for Shiraoshi/Poseidon
Poseidon was the name of the mermaid princess 800 years ago
Each centuries a Mermaid have her ability and becomes Poseidon
She's not actually Poseidon but only have her ability
and likely the same dream
Notice here that Joyboy made a promise to Poseidon and so did Luffy to Shiraoshi
So they most likely have only an inherited will
Not reincarnation bs
4) Joyboy is there to change the world
It was Kaido's dream and probably the reason he thought he was Joyboy
That's what Otohime said to
5) Who Can be Joyboy ?
I only see 2 criteria for now :
Strenght : At least Younko level or above
That's why Luffy wasn't recognize as Joyboy until now
Kaido said to Luffy you couldn't be Joyboy either
Willing to change the world : You need to has that will but it need to be in a good way
For example Kaido wants to change it but sure
But he wants a world of violence
Blackbeard wants to be the King of the world
I will made another thread about Joyboy/Ancient weapons/Imu and lots of others stuffs
I think we can link them now