Where my mind was when I asked the question was simply this. Skydiving instructors are licensed by the FAA and most, if not all, belong to the United States Parachute Association. Drop zones seem to cover their professionals because they don't seem to have to purchase individual professional liability insurance. Not sure what sort of policy drop zones have but apparently individual professional liability for skydiving pros does not exist.
With our two sports being very similar, how did skydiving instructors not have individual responsibility for insuring themselves like scuba instructors, and as I learned, climbing instructors? If Pete was willing to take off from a grass strip in a farm field and fly a dude name Daryl from Daryl's One Man Show Skydiving School, how does Daryl get a policy as a drop zone, not as an individual? Then if he hires two guys named Larry and another Daryl. How come Larry, Daryl, and Daryl don't pay individual policies? It doesn't exist so apparently, even an individual instructor needs to be a DZ.