What was the purpose of Sai Baba's incarnation if he was already the Supreme Brahman?

Chapter 43 clearly states that the incarnation of great souls like Sai Baba has a specific purpose: the welfare and protection of devotees. The text explains that he appeared in Shirdi, "gathered by the past merits of devotees," with the "sole desire for the welfare of devotees." Saints are described as being "essentially beyond the womb" and appearing "for the sake of helping others." Their rise and dissolution are for the "gathering of people." Therefore, even though Sai Baba is the Supreme Brahman and beyond the cycle of birth and death, he took on a physical form as a compassionate act to guide, protect, and uplift his followers, only merging back into his unmanifest state when the "task for the devotees is over."