What was Sai Baba's direct role in the writing of His own life story, and what conditions did He set for the author?

According to Chapter 2, Sai Baba's role was not merely to grant permission but to be the actual author. He stated, "He is merely a pretext; I myself shall write my own story!" To facilitate this, He laid out a crucial condition for the author, as detailed in the thirteenth chunk of Chapter 2. The author was instructed to dissolve his ego and surrender it completely at Baba's feet. Baba promised that for one who acts this way, He would provide full assistance and personally enter with 'I-ness' to write the story with His own hand, making the human author just an instrument for the divine work.