User blog comment:Doobie Wah/Jojolion Part 8 theories/@comment-131.151.252.107-20150731003449/@comment-131.151.252.147-20150731010335

Well, I figure those extra eyes etc. on Josuke came from Kira, it may turn out that Josuke might find some reduntant vital organs (maybe heart?) that Kira couldn't live without. Or maybe Kira did die and Josuke buried himself to try and save what Kira knew? Or maybe they were both recently dead and buried but the soil could fix Josefumi with Kira's parts.

Just reread  Yotsuyu's last speech underwater. It sounds like Kira sacrificed his organs to fix the dead Josefumi, maybe he is a bigger player than I thought.