@Monquito:
But Rayleigh said they figured their own interpretation, which might be different from theirs.
Meaning, they should find all the other poneglyphs.
On Skypiea, Roger left behind the words 'This message has been delivered to its end'.
I think the implication is that the 'Real / Rio Poneglyph' has been completedy by the Roger Pirates. They sailed not only to the places where the Road Poneglyphs are found, but throughout the Grand Line in the year that Oden was aboard the Oro Jackson. Robin even said in Skypiea, the 'Rio Poneglyph' is on Laugh Tale (or at least, that's how she interpreted the message Roger left behind).
Rayleigh and Oden both make it clear that they 'learned everything that happened in this world', so the implication is that they completed the 9 message 'Real Poneglyph' and I think that's probably evidenced by the fact that Robin hasn't come across a single Poneglyph which fits this particular category yet. She found some that talk about the weapons, Joy Boy's apology, etc. But the Roger Pirates likely took the 9 which contain the True History and brought them to Laugh Tale.
As for the part about 'reaching a different conclusion,' I think that's a misunderstanding which was cleared up by 967 / 968.
Rayleigh says that perhaps the Roger Pirates and the scholars of Ohara were too hasty as it was originally translated. He goes on to say the Straw Hat Pirates may reach a different conclusion.
The connotation here is that the Roger Pirates and scholars of Ohara acted in a rash manner because of a perhaps false conclusion.
But we have better context following Oden's flashback:
The Roger Pirates were not Too Hasty, they were Too Early
Someone who knows Japanese might be able to illuminate this a little better, but the Roger Pirates didn't act rashly. They didn't act at all. You can even find a big theory I posted about 10 years ago on this forum somewhere based entirely on that misconception / mistranslation. I assumed the Roger Pirates at one point confronted the world (The 'Roger Incident' as I called it) on the basis that they were 'too hasty'; We didn't know how the world came to call the Treasure One Piece as no one had ever spoken those words at Roger's execution and Dragon quoted a speech by Roger during his introduction, which I assumed might have been spoken during this incident.
This line is repeated in the Oden flashback where Roger concludes they're too early. So in this context, the conclusion Rayleigh references is not so much an interpretation of the history. We now know the conclusion the Roger Pirates reached from the history - that they were too early to do anything about it and thus disbanded. Roger created the Great Pirate era, to inspire a successor to arrive at the right time and inherit the burden of history, to confront the world (The WOrld Gov and Imu) and fulfill the purpose of One Piece. Whether that was the right decision remains to be seen. Roger trusted fate to deliver the right hero at the right time instead of hand picking a successor or confronting the world before all the pieces were in place.
Sharley delivered a prophecy that Shirahoshi would be born in 10 years and take 15 more to grow, which was a critical factor in Roger's decision. We see him weighing his options - Roger was a dying man, who couldn't wait 25 years. And so instead, he disbanded his crew, turned himself over, and used his dying words to pass the message along. His actions were the exact opposite of excessive haste.
So now that we know Roger's conclusion, that he was too early to confront the world and thus did nothing, the conversation between Rayleigh and Robin has a completely different meaning. There's no implication that the nature of what is revealed is vague or open to interpretation; He's saying that the Straw Hats, when they learn the terrible truth of the world, may question the wisdom of the Roger Pirates in not acting immediately and instead letting things be for the next 25 years. The Roger Pirates know that something has to be done, but they concluded they're not the ones to do it. Oden even says this to Toki in 973 I think - that someday the people who will liberate Wano will arrive.