According to the teachings in Chapter 39, what was the primary reason for Sai Baba's incarnation and arrival in Shirdi?

Chapter 39 explains that Sai Baba's presence in Shirdi was not a matter of chance. While he arrived with Chand Patil's wedding party, the text clarifies that this was merely the means. The true purpose of his incarnation and arrival was driven by a "great concern for the upliftment of his devotees." The chapter specifically highlights that Sai came to uplift the "dull-witted, the fallen, and the poor," as well as simple and faithful people who lacked formal vows or penance. This compassionate mission to elevate the humble and devoted is presented as the core reason for his advent in Shirdi.