What does Chapter 20 reveal about the fundamental nature of Sai Baba and his presence in Shirdi?

Chapter 20 describes Sai Baba's dual nature. It explains that he is originally formless but took on a physical form for the sake of his devotees, playing a role like an actor. His presence in Shirdi transformed it into a 'Siddhashram,' an abode of the perfected. The chapter states that the mere sight of him relieves the fatigue of worldly life and his constant presence drives away the delusion of existence for those close to him. He is presented as a refuge who provides eternal rest, ending the cycle of rebirth for his followers.