Roger said he arrived at Lonestar a year before God Valley, he learned of the existence of the “Final Island”, there and wanted to go but couldn’t go because he needed the four poneglyphs, and he knew back then if he made it he would be able to complete his childhood dream.
But you seriously think he had no dream during god valley…
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I think it’s because he wanted to establish that Roger was already a legendary pirate before even God Valley.