Board Thread:Questions and Answers/@comment-30966312-20180814013025/@comment-37473393-20181111061109

Jotaro simply learned to do it at that moment, makes meaning that he has not discovered all his abilities, since Star Platinum had just manifested days ago. I do not think Araki has planned for Jotaro to stop time from the start, but I do not think he not knew how to defeat DIO either. The power of DIO appeared almost until the end, and the fight against jotaro began few chapters later, I do not believe that Araki has assigned power to DIO and then does not know how to defeat him (that reminds more of GER and crimson king), in that case I would have given him another power that was not so OP. I think Araki wanted the final fight to be between two men with stands that could stop time and fly, Araki if he wanted to give that power to Jotaro. But it does not make meaning to seek an explanation to that, at least not contradicted the established logic of the stands so much, and at least Jotaro did not master the technique instantly, had difficulties to master it and at least one effort was noted in both during the fight.