According to Dev's own reflection, what specific factors caused him to be deluded and fail to recognize Sai Baba as the Sanyasi?

After learning the truth from Jog, Dev reflected on why he was so completely deluded. As Chapter 40 details, Dev realized his confusion stemmed from a key fact: the Sanyasi's first appearance had occurred before Dev had even extended the Udyapan invitation to Sai Baba in Shirdi. During that initial visit, the Sanyasi was collecting funds for cow protection. Because this meeting happened first for a different, worldly purpose, it did not occur to Dev that this same person could be Baba. Dev also admitted his own carelessness, lamenting, "Only one word of Baba's—'When I come for the meal, two others will come with me'—I forgot to pay attention to that." This prior encounter combined with his own inattention created the delusion.