Because it did after they both died their chakra went into other people. if one died before the other then the whole reincarnation would be messed up Naruto and Sasuke same age but Sasuke a little older Hashirama Madara should be same age or Madara a little older if one died and the other didn't then Ashura's reincarnations should be older right?Sage also said it started a longYou must be registered for see links. BZ said Asura won or Indra lost.