After his grandfather showed up to his jail cell and meet all the others he seemed to remember something. You. Not long after he discovered his stand, he could sense that energy on you, you were a friend of his, he seemed to like you due to the fact you yourself were quiet. After your stand fully developed you had run away, hid yourself from the world, seemed you didn't ant anything to do with stands, but you could be useful on this mission.

And despite it all, he kinda missed you.

So, he informed the others, and they all went out scouting for you, eventually finding you out in the woods by yourself, simply wondering while your stand lashed out at any trees standing around it, shattering it into pieces.