Based on the provided text, how did Sai Baba's purpose for his devotees relate to his physical incarnation and departure?

Chapter 43 presents Sai Baba's physical incarnation as a deliberate act undertaken for the benefit of his followers. He is said to have 'appeared in Shirdi for the sake of the devotees’ protection,' drawn by their collective past merits and devotion. His physical body is described as an 'adjunct,' a temporary vessel used to fulfill his mission. The text notes, 'Now that the task for the devotees is over, they say he left the body.' This implies his departure was as purposeful as his arrival. As explained in Chapter 43, his entire physical manifestation was a 'spontaneous play of Yoga for the sake of the devotees' salvation,' and upon its completion, he merged back into his unmanifest, all-pervading true self, while still remaining in the hearts of his devotees.