During the Wano Arc we have seen the Roger Pirates reaching the last island in the Grand Line, Laugh Tale.
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Roger and his crew’s reaction upon finding Joy Boy’s treasure was simply laughter. This led Roger to name the island after what he considered a “funny story”, referring to whatever happened to Joy Boy.
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We see 5 notable characters who discovered the truth behind the Void Century, the Ancient Weapons, and the family of “D.”: Gol D. Roger, Silvers Rayleigh, Kozuki Oden, Scopper Gaban & Crocus with 2 of them being dead, while 1 is missing and 2 are alive & retired.
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Both Rayleigh & Crocus help Pirates on their Journey by staying in both Reverse Mountain & Sabaody so if Scopper is alive, I expect him to be in another important Island waiting to guide too, and the only Island in my mind is Lodestar Island.
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*Theory by Salah Eddine