During his questioning with the Namriks, his worries that he had before didn't have a lot of meaning to the entirely new race. Quinn had always presumed that there very well could be a celestial that was looking over the current planet.
Just like the celestial that was looking over the Memerial race, and Athos who was looking over the Amra. In some ways, Earth had Sera and Bliss looking over them. Depending on how big of a population there was, it seemed that there could be many celestials looking over it.
This was why, just in case, when Quinn was travelling he had put on the mask that Minny had given him, hiding his face. If a celestial saw who he was, they could enter the celestial space, and inform Mundus that Quinn had escaped.