OMG you aren't even sure, if it's started in MF or FM Island.
WB said that the person Roger was waiting for isn't BB, and the prophecy about Luffy wrecking the FM island doesn't imply that he will simply get reincarnated as Joyboy, it was about "will" not free pass to success.
You can't even comprehend stuff and just go with the flow, right? go reread