Based on nothing but what I have read in the various threads dealing with the matter I suspect that it will show that when the flight departed Samoa for Norfolk Island it was legal and did not require an alternate due to weather.
I suspect that it will also show that despite the company, either having a dispensation from carrying alternate fuel to a remote island or it was not required due to the fact that the flight was under the airwork category, that it did have sufficient fuel to reach an alternate up to the point about top of descent into Norfolk Island.
Based on what I have read in the various threads dealing with the matter and in the preliminary report, it was a charter flight - Pelair was not the air ambulance operator, careflight was. Pelair was just a chartered aircraft supplier.