What was Sai Baba's underlying purpose for coming to Shirdi, and who were the primary beneficiaries of his incarnation, based on the teachings in Chapter 39?

Based on the details in Chapter 39 of the Shri Sai Satcharitra, Sai Baba's incarnation and arrival in Shirdi were driven by his profound concern for the upliftment of his devotees. The text explicitly states that he came to Shirdi of his own accord for this reason. The primary beneficiaries of his grace were identified as 'the dull-witted, the fallen, and the poor.' He specifically came to elevate those simple and faithful people who lacked formal vows, penance, or sacraments, demonstrating that his mission was to provide a path to spiritual upliftment for all, regardless of their station or austerity.