What is the deeper reason given in the text for Sai Baba's incarnation and arrival in Shirdi, beyond the story of Chand Patil?

While the narrative involving Chand Patil explains the circumstances of Sai's arrival, Chapter 39 reveals a more profound spiritual purpose. The text explicitly states that Chand Patil was 'merely an instrument.' The true reason for Sai taking an incarnation and coming to Shirdi was his 'great concern for the upliftment of his devotees.' This chapter emphasizes that Sai's mission was to uplift the 'dull-witted, the fallen, and the poor,' and other simple, faithful people who lacked formal vows or penance, demonstrating that his arrival was a deliberate act of compassion.