Can you explain the transition of Sai Baba from 'Nirguni' to 'Saguni' as detailed in Chapter 30?

According to the teachings in Chapter 30 of the Sri Sai Satcharita, Sai Baba's fundamental nature is formless, or 'Nirguni'. However, the chapter explains that it is through the compelling qualities of his devotees' pure devotion that he is drawn from this formless state into a form with attributes, which is known as 'Saguni'. This transition is not a change in his essential being but rather a compassionate manifestation for the sake of his followers. As the text states, 'In the beginning, You reside as the formless (Nirguni). Then, through the qualities of devotees' devotion, You draw the formless into form with attributes (Saguni).' This demonstrates his loving response to his devotees' faith.