This requires a much earlier PoD, as the upgraded CF-5D would have been a step down systems-wise from the Kahu-upgraded Skyhawk that started entering service in 1989-90 (as in one or two respects would have been the block 15 F-16A/B). The RAN A-4G's were acquired with the Kahu programme in mind, so if acquiring the CF-5D means butterflying Kahu, it also means butterflying the A-4G acquisition, which then introduces an A-4K replacement in the 80's. The F-5 was considered and rejected by the RNZAF in favour of the initial A-4K purchase (at the same time the Canadians were considering and rejecting the A-4 in favour of the F-5), so a change of mind on that would be needed as well.