Hi im 75lvl Earth player, i got 4* Sasuke with 75/200 fragments. I use Sasuke in some lineups, but he is not top priority. Is it better to keep him 4* and get Kirin to +1 or +2 to have 4/12 enemy paralisis for ranked, or just get him 5* and farm fragments to refine for Iruka (i have 2* Iruka) / 9tail chakra Naruto (don't have him)?