Interesting theory, but wasn’t a big part of Roger being too early the fact that Shirahoshi wasn’t born and still needed to grow to become Poseidon?
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I don't think that Roger was early for some external reason, he's just at the wrong time for him. For all we know, Joyboy's treasure and the ancient weapons aren't directly related.
Im sorry, but are you dumb or are you incapable of reading?
http://www.funmanga.com/uploads/chapter_files/5404/982/55.jpg
It is very clearly and directly said that Roger was early because of Shirahoshi not being born yet. But also, the sea kings know [and told him] he wasnt Joyboy.
Well, that's certainly one way you could phrase a counter argument.
I think that positions Luffy in a really interesting spot because he has been shedding his life span throughout the manga, like in Impel Down.
That was really only a thing in Enies Lobby and then Impel Down. I don't think that will be a factor for Luffy. There's just too much child of prophesy stuff riding on him finding the One Piece and being the guy that Joyboy and Roger were waiting for.
As for why Roger laughed, I don't think it was because he was too early and wouldn't be able to fulfil Joyboy's wish. I subscribe to the theory that Luffy's dream is to throw a party for the whole world. The One Piece probably plays into that somehow. Like maybe its some instrument that allows everyone in the world to hear it, or maybe the original Binks Sake or something like that. Something that is goofy and not the traditional treasure that pirates would lay their life down to find. Hence, its funny and that's why Roger wishes he lived in the same time as Joyboy.