Pretty sure that's the case, but he and Ragatha were alone for at least a little while. Ragatha didn't understand Jax's Breaking Bad reference, a show that has become so ubiquitous that most people at the very least know the basic premise of it being about a chemistry teacher who starts cooking meth to pay for his cancer treatment, so it's safe to assume she arrived sometime before or early on in its run before it exploded in popularity.
According to Nooseworx the show takes place in 2017, and Breaking Bad started airing in early 2008, so at minimum she's been in the circus for nine years. In that entire time, including however long it was just her and Kinger, she somehow didn't discover he becomes lucid in dark places? Somehow in all that time there were never any circumstances in Caine's wacky adventures that forced them into the dark, but then Pomni arrives and she just happens to be in the right place at the right time to wind up alone with him in a scary dark basement? It's very sloppy writing.