User blog comment:Kaido King of the Beasts/Chapter 818: Stepping Stones to One Piece/@comment-3203286-20160303140324/@comment-10543621-20160304013503

There has to be some reason for the Roger pirates to be unwilling to share information on what's on Raftel. The fact that Oden was killed, possibly for refusing the divulge information. Also, you'd think that the WG would make more effort in killing ex-roger crew members like Rayleigh and Crocus. I guess Rayleigh is obviously hard to kill, and they probably don't know Crocus. But clearly, these guys haven't been revealing the secret of Raftel as well, so there has to be a reason.

This makes the actual secret all the more mysterious. Honestly, I wonder if Oda has even decided what this massive secret is gonna be. With One Piece still seeming like it's never ending, we could be looking at easily another 10 years. After decades of suspense, this better be one hell of a secret.