In the first book, we're made to believe that four of the glows died before the events of the series. However, the second and third books introduce Torstyn and Tessa, and the fifth book introduces Cassy, who Hatch allegedly never knew about, giving us one more that has yet to have been introduced. The book handwaves it by saying that Hatch was just lying, but what did he have to gain from it? Well, maybe he was talking about Ian, McKenna, Abigail, and Tessa, whom have betrayed him in the past. In other words, they were dead to him.
Torstyn is a remorseless psychopath who enjoys using his powers For the Evulz. Hatch making him The Dragon makes sense.
J.D. requesting to Hatch that he keeps Taylor as a pet. Considering that he flirted her earlier in the book, it's obvious that he wanted to keep her as a sex slave.
