These characters are becoming more and more better, Kira went on a journey to cure his mother presumably. And Josefumi( the name of the man whose photo was shown by Karera) isn't that much similar to part 4 Josuke.
Imagine if josefumi gets separated and somehow end up in an alternate dimension in the final battle of part 8, and that's when he meets young Josuke and thus he gets his haircut.