According to Chapter 1, how is Sai Baba shown to be the embodiment of multiple deities?

Chapter 1 of the Shri Sai Satcharitra powerfully establishes Sai Baba as the embodiment of various principal deities. The text explicitly states that Sai himself is Ganesha, who destroys obstacles. It then goes on to say that Sai is also Goddess Saraswati, who sings his own life story for his devotees. Furthermore, after bowing to the trinity of Brahma, Vishnu, and Shankar, the author addresses Sainath directly, declaring, 'O self-effulgent Sainath, you alone are our Lord of Ganas (Ganadhish), the Lord of Savitri (Brahma), the Lord of Rama (Vishnu), or the Lord of Uma (Shiva).' As mentioned in this first chapter, this demonstrates the core teaching that Sai is the supreme, non-dual Sadguru, encompassing all divine forms.