First of all, condolences to all concerned, a very sad day!
It's interesting to note the calls for ATC in PP after there is an accident. As previously mentioned Taupo is much busier than PP and with a more diverse mix of traffic, and yet most of the calls to get ATC or some air traffic service into Taupo pretty much fall on deaf ears. I would have thought this would be a wake up call to those operators in Taupo who feel that the "locals" can look after themselves. It appears that these were "locals" in PP.
Big sky theory doesn't work too well when it's full of aircraft all doing different things!