This was one of my old theories....that has hidden himself in the fruit of darkness..But now I can give a better argument for it
When Zunesha heard the voice of Joy Boy..But it was only when he heard joy boy's voice that Luffy used his awakening..So I feel there is a strong connection between the df and the user
And I think he used all his power to hide the island in the fruit..So I believe that Rocks is alive inside the fruit
It is also possible that Laugh Tale has a strong connection with the Luffy's fruit.
What do you think about it?

When Zunesha heard the voice of Joy Boy..But it was only when he heard joy boy's voice that Luffy used his awakening..So I feel there is a strong connection between the df and the user

It is also possible that Laugh Tale has a strong connection with the Luffy's fruit.
What do you think about it?