Comment by ryzoichi-san on Hell's Paradise: Jigokuraku - Chapter 46

@ryzoichi-san because "gabimaru" is not just a name, its basically a title for the strongest iwakure ninja. That way "gabimaru" seems immortal because the name gabimaru lives on to the next new strong ninja

@ryzoichi-san i think gabimaru is the best ninja iwagakure had. so leaving the group is not an option