Board Thread:Naruto Discussions/@comment-29393962-20161111215453/@comment-25122992-20170117195243

@Namikazenaruto9, Indra's/Asura's transimigrates don't have the same souls whatsoever. The only things getting passed over and over are their chakra (though not completely, since each reincarnation still has their unique chakra signature) and will (or, rather, personality/ideology), but not the souls themselves. But only one generation of transimigrants could exist at the same time, that's why Hagoromo stated that Madara broke away from the cycle and quitted to be Indra's reincarnation after the revival.