According to Chapter 52, why was Hemadpant chosen to write the Sai Satcharitra, and what was the source of its content?

Chapter 52 explains that Sai Baba himself orchestrated the writing of his true life story through Hemadpant. It's specifically noted that Hemadpant was chosen despite being "devoid of specialized knowledge and learning," implying that it was Sai's grace and guidance, not Hemadpant's own scholarly prowess, that produced the work. The chapter clarifies that Sai held Hemadpant's hand, figuratively, to cause the story to be written. The content originated from two sources: some of Sai's fame he narrated with his own mouth while he was alive, and the inspiration for the rest of the book came after he departed to his own abode.