Is there any evidence or comparison to other saints that supports the idea of Sai Baba's continued presence after leaving his body?

Yes, Chapter 43 draws parallels between Sai Baba and other revered saints to illustrate the concept of their eternal presence. The text explicitly asks if Maharaj Gyanoba (Gyaneshwar) truly left, noting that he gave darshan three centuries after his samadhi. It then lists other great figures like Tukaram Maharaj in Dehu, Narasimha Saraswati in Alandi, and Samarth Ramdas in Parli, placing Sai Baba in Shirdi within this same lineage of powerful, miraculous avatars. This comparison reinforces the idea that Sai, like these other saints, remains unbroken and eternally present. In his true form, he fills the moving and non-moving world, and the experience of his presence depends on the feeling in the devotee's own mind.