In the chapter 0, Shiki said that Gol D. Roger had one of the ancient weapons
Had one isn't " having infos " about it. If that doesn't mean he have one in his pocket then what ?
Can you pick any example where I can confirm that Roger believed in fate?
We have enough evidence in the manga, testimonies made by characters that literally saw Roger in Luffy. Shanks, Rayleigh, WB... If you still refuse to admit that Luffy is nearly a copy of Roger, then what can I do for you ?
Again, I'll explain from zero : Manga is the source right ? We can assume (for me, on matters like these, it is 100% because it is heavily implied by Oda), if I say for example Roger believe in fate. And I give examples of Shanks, Rayleigh, WB, even Gan Fall. In matters like these, yes we can clearly say that Roger believe in fate, that he thinks the same way Luffy did.
Things we wait for Oda to confirm : Location of a weapon, name of a weapon, island, the character's ability... Did you same say it is 100% that BM will have this and that power ? No, there's no real clues nor anything to deduce that.
Then I'll say it again, Oda said that Roger knew about the real history, and knew about the 3 weapons. Good. Did he ever implied one being in Raftel ? Not even once. He put an emphasis on the real history (or the Rio Poneglyph) being in Raftel through two testimonies : Robin's one back in Skypiea where she deduced that you need to gather to Tablets of truths to know the true history, and that the tablet of clues are the one who shows the location of those tablet of truths along with the weapons, and obviously Roger recovered those tablets of truths, and it is 100% certain that is in Raftel. He did not put a single emphasis on any weapon being there.
What you is saying is that there is a weapon in Raftel, okay. You back up your entine theory by just a single line said in that chapter, disregarding other things such : Roger's personality, what was said by Robin & Rayleigh. That single line, who is by the way quite clear, says " Roger you know the location of the weapon " period. Not " Roger you HAVE the weapon ".
Your theories that you make are based on lines, misreading (aka the second Poneglyph in each island), not logical at all (in the case of BM strenght). Making theories is nice, but making theories while taking into account : Consistency in the story, past events, thinking nearly like Oda does, is even better.