What is the primary theme and what stories are introduced at the beginning of Chapter 51 of the Sai Satcharitra?

Chapter 51 of the Sai Satcharitra begins by establishing its purpose as a purifying narrative, stating that listening to the Sai Charitra makes both the listener and the speaker pure. After referencing the previous chapter's discussion on destroying ignorance, it sets the stage for the stories to come. As detailed in Chapter 51, the main account will be the marvelous history of how Kakasaheb was established in Shirdi, exploring his deep bond from past lives (rinanubandh). Additionally, the chapter promises to soothe the hearts of listeners by also narrating three other stories concerning three different devotees.