Given that the book mentions Sai Baba saying 'Allah-Malik', can you provide a detailed comparison between Sai Baba's philosophy and the core tenets of Islamic Sufism?

The source material does not provide enough information for a detailed comparison between Sai Baba's philosophy and Islamic Sufism. Chapter 19 does record Sai Baba using the phrase 'Allah-Malik, Allah-Malik' (God is the Master), which clearly demonstrates his inclusive spiritual language and his core teaching that there is one supreme protector. However, the chapter uses this to illustrate his universal outlook, not to delve into a comparative theological analysis. The surrounding text in Chapter 19 focuses on other key principles, such as the importance of one's own actions ('As the action, so the hearing'), the karmic ties of 'Rinanubandha', and the devotee's surrender to the Guru. The narrative emphasizes the direct experiential path of devotion over academic or comparative study of different traditions.