Can you tell me about the yogi who visited Baba in Chapter 23 and what he observed?

Certainly. Chapter 23 recounts the story of a practitioner of Yoga (Yogabhyasi) who came to Shirdi with Nanasaheb Chandorkar. This man had studied the Yoga Shastras extensively but was frustrated by his inability to achieve Samadhi. He held a strong belief that Sai Baba, being a "King of Yogis," could grant him this profound meditative experience through his grace. However, upon taking Baba's darshan at the Masjid, the yogi's expectations were met with a very simple, human scene: he saw Sai Baba eating bread (bhakar) along with onions. This observation set a stark contrast to the grand spiritual experience he had anticipated.