Despite Dierker's Devil Luck to survive every ambush and attacks Devlin throws at him throughout the game, ultimately Devlin gets to kill him for good in the ending, showing Dierker can't fight his fate of dying.
Even after she gives away her necklace, Ishizu continues to prophesize the coming battle, so, so much, its like her most common dialogue.
Andrea Collins goes back in time to when Hitler was an infant and succeeds in killing him then, but then the baby's nanny finds another child and that's passed off as Hitler.
They later try to put an end to this when King kills himself and Gale sacrifices himself to save Haru, but it turns out King's kid wasn't dead after all, so the cycle repeats.