Could you summarize the key stories and teachings presented in Chapter 20 of the Sai Satcharitra?

Chapter 20 of the Sai Satcharitra covers two main topics. First, it provides a beautiful description of the scene in Shirdi after the midday Aarti. It details how Sai Baba would lovingly distribute Udi to his devotees, applying it to their foreheads and then sending them off to have their meals. Second, it introduces a story involving Das Ganu, who was struggling to understand the deep meaning of the Ishavasya Upanishad while writing a commentary. Seeking a solution, he approached Baba, who cryptically told him that his doubt would be resolved by a maidservant at Kaka's house, highlighting the importance of a Guru's grace.