The best thing now would be to let the Canadian TSB do the repeat investigation into the Norfolk Island crash.
After all, justice not only has to be done. It has to be seen to be done.
There are precedents for this. The Canadians have previously investigated a crash in USA that involved an FAA employee.
Some assistance from HF experts maybe Mr Ben Cook (now in the ADF ) would be justified.
2. In the Norfolk Island investigation, the analysis of specific safety issues including fatigue, fuel management, and company and regulatory oversight was not effective because insufficient data were collected.