Board Thread:Articles Discussion/@comment-45870743-20200604232633/@comment-45182298-20200606173632

No, it's not canon that jotaro is in the manga of part 2, David Productions, put this in as something to confirm that they were gonna do part 3 later on. The ending of part 2 in the manga is joseph saying, 'i'll never forgive the japanese'.

Edit: uh my bad, i forgot it's called a teaser but, basically the same thing.