On the Genealogy of Morals

Although many people think, the piece "On the Genealogy of Morals", is not written by Nietzsche alone.  It is also written by Mazzino Montinari and Giorgio Colli.  Montinari was an Italian scholar of Germanistics, including Nietzsche.  Colli was an Italian philosopher and studied much of the same things as Nietzsche.  In the prologue one of the authors talks about one of their imperfections.  He questioned where good and evil really originated.  He talked about introspection and how he thought of his question and his thoughts about himself.  He states how much humans are bad at introspecting.  Also a lot of this prologue is him asking himself questions as if he, himself, doesn't know what he is writing about.  so this prologue could have been by any of the three authors Nietzsche, Montinari, or Colli.