I haven't really decided what I want to do with those other side characters yet. I chose Ninjor for the base fact that he understands the Morphing Grid and how to create rangers, Mr. Collins for forming an actual force and understanding how to pick a ranger with military talent, plus he would have funds that might be needed. Dr. K for her understanding of Vengex and the fact that her actress went on to marry Ziggy's actor. Just makes their relationship canon in my eyes. Granted Fairweather might come around later to help build the zords.