Board Thread:Questions and Answers/@comment-6576725-20180811021454/@comment-31598739-20180811065046

And I doubt Jotaro would get in contact with Josuke so suddenly after Jolyne's arrest. Plus, it would be a hastle and probably put him in danger. Josuke is not involved whatsoever with Jolyne and doesn't need to be. Hell, Josuke is practically uninvolved with everyone else in the family.