According to the source, what is the true nature of Sai Baba's existence beyond his physical body?

The source material in Chapter 43 delves into the metaphysical nature of Sai Baba, portraying him not as a person bound by a body but as 'a mass of bliss' and the 'complete Supreme Brahman.' His physical form was merely an 'adjunct.' Upon leaving his body, he did not die but rather 'merged himself into the unmanifest,' attaining his 'previous unmanifest state.' The text describes this as becoming 'one with Brahman.' In this true form, he fills the entire 'moving and non-moving world,' continuing to exist in a state of his true self while actively keeping his devotees spiritually 'awake.'