According to the provided text, what does Chapter 51 promise to reveal about Kakasaheb's connection to Shirdi?

Chapter 51 explicitly sets the stage for a detailed account of Kakasaheb's origins in Shirdi. The text states its intention to narrate the 'marvelous account of how Kakasaheb was established in Shirdi.' It acknowledges that while his stories are generally well-known, the specifics of his initial arrival are not. As described in Chapter 51, the narrative will explore the 'entire history of his bond of past lives (rinanubandh) with Shirdi' and his firm relationship with Sai, linking this fortunate meeting to the merits of past lives and the grace of the Supreme Lord.