Why was Dev so disappointed after his Udyapan ceremony, even though he had invited Baba?

Dev was deeply disappointed because he believed Sai Baba had not kept His promise to attend the Udyapan ceremony. As detailed in Chapter 40, Dev had invited Baba with great love, and Baba had assured him, "I am coming." However, Dev was expecting Baba to appear in a recognizable form. When three uninvited guests—a Sanyasi and his two companions—arrived and were fed, it did not occur to Dev that this was Baba in disguise. He wrote a letter to Jog expressing his confusion and feeling of being deceived, lamenting that despite his efforts, he received no "experience" and that things had "turned out otherwise." His doubt overshadowed the actual event, leading to his profound disappointment.