Power Of the Sun in One Piece

What if Luffy didn’t eat the rubber rubber fruit?
But instead has eaten something much more dangerous?

*I don’t own one piece, it belongs to Oda-Sensei*
*There are also pieces or things that are owned by WOTC, they own it, I just want to use it in the story to have more of a flavor for the story. (For all of you PC’s, you know what I’m talking about)