I think you meant hearsay, not heresy. Quite a difference in meaning between the two.
As for someone here having a source on the RNZAF airlift requirements... Until the review of the Future Air Mobility project is released (which was supposed to be sometime in 2015, which is almost over...) then it is largely a matter of opinion and guesswork.
There are a few things which are known however. One being that the current air transport fleet has in recent years proven not up to meeting tasks assigned to the NZDF by Gov't, upon occasion. Another is that at least some of the future airlift has to have strategic range while transporting a useful load. Something that the USAF and RAAF (and I forget but suspect the RNZAF as well) have learned is that most loads being airlifted are 'tactical' loads, being smaller in size and weight than a fully loaded C-130. With that in mind, not every airlifter in NZ service needs to be large and with a heavy lift capacity, otherwise many, perhaps even most missions, would be flown by large and largely empty aircraft, resulting in cost inefficiencies for many airlift missions.
Part of what the FAM review was to accomplish, was determine what sort of range and load numbers the RNZAF needed for various missions, and how often those missions occurred.
IMO the RNZAF needs to adopt either a three tier, or four tier system for future fixed wing air transport. The lowest tier would be small multi-engine aircraft for liaison and personnel movement, but could also be used for MEPT and some local MPS (a la Beech King Air 350 or similar aircraft). Moving up from there would be the tactical airlift component, which could be either a single tier, or two tiers, depending on whether or not having both light and medium tactical airlift was deemed worthwhile. This tier (or these tiers) could be filled by aircraft like the CN-235, C-27J, C-295, or even C-130J. It would depend on the number of aircraft needed, their respective costs (both acquisition, as well as maintenance and operations) as well as the cargo size/weight and airlift distance requirements. The 'top' tier if you will, would be the strategic and heavy lift aircraft, which IMO should be something in the A400M or C-17 class. It could potentially be another commercial airliner of course, but I believe doing so (again) would be a mistake, given the potential service needs and aircraft limitations, plus the potential availability as needed to have chartered commercial aviation cover some common airlift needs.