I think that time in this case is of the essence and also in other HADR cases the same can be said. My own view that claim by the pollies and bureaucrats that Canterbury can deploy them in HADR is a fiction, because it takes time for Canterbury to do a crash run to sea for HADR and then sail to the scene of the HADR.You do have to remember that NZ can deploy the NH-90 via sea, HMNZS Canterbury could have taken all 3 in one hit, HMNZS Will soon be able to deploy them and I am sure the when the SOPV and 2nd Enhanced Sealift vessel will all be able to.
But it is a matter of time and perspective... Did NZ also offer HMNZS Canterbury and other equipment, did the Aussies offer the C-17 to fly them over after HMNZS Canterbury was offered or before? Remember Canterbury's crew most likely on Leave etc...
The other case is when they deployed the NH90s to the Solomons for their election and the RAAF ferried them there in a C-17 and returned them back to Ohakea. Would've it been practical to have Canterbury sail them to the Solomons and hung around for the month or whatever it was whilst they were up there?
We'll undoubtedly be going back to Bougainville now that they've had their independence referendum and it was indpendence was voted infavout of by something like 96%. The PNG govt are unhappy campers, so what happens next remains to be seen, but as sure as your a*** points to the ground we'll be back up there.