How does Chapter 34 illustrate the power of Udi against seemingly incurable diseases?

Chapter 34 uses a specific story to illustrate the immense power of Sai Baba's Udi. It describes a terrible disease called a bone-cyst (Hadyavran) that afflicted a doctor's nephew. This malady was so difficult that it could not be cured by any available remedy, whether native or foreign, and even surgery failed. The chapter explicitly states that this story is an illustration of Udi's majesty and that smearing Udi from Sai's hand could completely uproot the pain from such a disease. By showing Udi succeeding where all medical science had failed, the chapter highlights its divine and healing qualities.