Police did not rule out the possibility that he had been murdered, and also considered the possibility that he was hiding, being a frequent visitor to Hawke's Bay and Australia.
Yesterday, Mr Crawford said there were lots of theories, but no progress on explaining why he vanished.
Tasman police district manager of criminal investigations, Detective Inspector Geoff Jago, said: "I am aware a number of outcomes are being discussed, one of which is that he is somewhere in Australia."
However, the Australia theory had never been confirmed one way or the other, he said.
Mr McAllister moved to the West Coast five years before he disappeared, to take up gold panning.
Land, air and river searches were carried out, including checks of abandoned mine shafts in the old goldfields, but all failed to turn up any trace of the missing man.
His daughter, Brenda Wilkinson, of Brisbane, said at the time she believed he had been the victim of foul play and had not met with an accident or faked his disappearance.