Board Thread:Naruto Discussions/@comment-1926479-20140528055515/@comment-2120712-20140529014211

Which begs the question, just how did Kaguya's era end? Did she get absorbed the tree(therefore absorbing her mind and will), defeated by her sons, or like the sage die of old age. My guess is that the sage left no remaining records of how Kaguya's rule was ended and therefore Madara forgot to look over the fact that the artificial humans(the zetsu's) were basically Hashirama's dna + Kaguya mind/will.