Was Sai Baba the only holy person in Shirdi when he returned with Chand Patil's group?

No, according to the prologue of Chapter 5, Sai Baba was not the only saintly figure in Shirdi at the time of his return. The text explicitly states that before Baba's reappearance in the village, other saints were already present there. It mentions that a saint named Devidas had already made Shirdi his home for some time. Additionally, another holy person, Janakidas Gosavi, had also come to live in Shirdi. This indicates that Shirdi was already a place with a spiritual presence before Baba's fated return with Chand Patil's wedding party.