According to the introduction in Chapter 51, which specific devotee's history will be narrated, and what is mentioned about this story's familiarity among people?

The introduction of Chapter 51 explicitly states that it will narrate the marvelous account of how Kakasaheb was established in Shirdi. The text highlights a specific detail about this narrative, noting that while Kakasaheb's stories are numerous and widely known to everyone, young and old, the particular history of how he first came to Shirdi is unknown to many. This framing, as presented in Chapter 51, sets up the chapter to reveal a less-common story about a well-known devotee, focusing on his bond of past lives (rinanubandh) with Shirdi.