How did Sai Baba attend Dev's Udyapan ceremony without Dev realizing it?

Sai Baba attended Dev's ceremony in the guise of a Sanyasi, accompanied by two other individuals. As detailed in Chapter 40, Dev had invited Baba, who promised to come with two others. On the day of the Udyapan, a Sanyasi arrived around noon with two companions. Dev, thinking him to be just another guest who came for a meal, served them but failed to recognize that this Sanyasi was Baba himself fulfilling his promise. Baba later confirmed this to Jog, stating, "I said I would come with two others, and I went with two others... do you not remember the Sanyasi's guise?"