What is the main focus of Chapter 51 of the Shri Sai Satcharita, and what topics does it promise to cover?

Chapter 51 of the Shri Sai Satcharita serves as an introduction to several key stories that will be narrated. The author states their intention to detail the "marvelous account of how Kakasaheb was established in Shirdi." As described in this chapter, the narrative will explore the history of his bond from past lives, or 'rinanubandh', with Shirdi and his firm relationship with Sai. In addition to Kakasaheb's story, Chapter 51 promises to describe three stories of three other devotees, which are intended to soothe the hearts of the listeners.