I have never known NAUI to reduce the number of required dives for any course even by one dive let alone from 5 to 1.
One can't ignore the possibility that there is an underlying medical condition that was the actual cause for accident. I have had students in the past falsify their medical records to take the scuba course even when they had real serious medical conditions that would be very dangerous for them to go U/W on scuba. Fortunately, I was able to find out about their medical conditions before we had the chance to go to Open Water for their training dives.
One can't ignore the possibility that there is an underlying medical condition that was the actual cause for accident. I have had students in the past falsify their medical records to take the scuba course even when they had real serious medical conditions that would be very dangerous for them to go U/W on scuba. Fortunately, I was able to find out about their medical conditions before we had the chance to go to Open Water for their training dives.