Board Thread:Theories and Speculation/@comment-44437908-20200507033747/@comment-24824859-20200507214634

Had Madara actually die at the Valley of the End, then Naruto and Sasuke wouldn't be the next reincarnations of the Sage's sons. The chakra of the sons only move on when both reincarnations die. The only reason why Naruto and Sasuke were the next reincarnations is because Madara cheated death via Izanagi and exceeded his natural lifespan due to siphoning life-force from the Gedo Mazo. Had things went "normally" the next reincarnations would have likely appeared in Jiraiya's generation.