Broken Mirrors of a Tsunami's Psyche

Tomioka Giyu's dead body was found burned in the middle of a secluded area of the forest. Cause of Death: Seppuku, Self Imolation... Suicide. However as everyone mourned, someone who looks exactly like Tomioka Giyu, sounds exactly like Tomioka Giyu, is Tomioka Giyu claimed he will make them all suffer, as Giyu had suffered. AKA: What if Tomioka Giyu suffered from D. I. D.