He chose Koichi to take Giorno's skin sample because, unlike him or Josuke, Koichi had a long-range Stand that he could use to track Giorno from afar. Jotaro clearly likes and respects Koichi a lot more than he does Josuke, he sent him to check Giorno (who's Dio's son obviously) in Italy after all. JJBA DiU: Jotaro and Koichi vs Yoshikage Kira Supercut - Duration: ... JoJo - Polnareff "saves" Jotaro, then Jotaro saves Polnareff - Duration: 3:59. putoflowleridano 6,878,397 views. plus, Josuke is too hot-blooded for Jotaro's taste.