I don't think anyone's arguing that certification level is always a good indicator of a persons abilities. I'm only AOW for example, and I'm amazing
PADI training can certainly be something of a joke (although I have heard that the rescue diver course is fairly energetic) but this misses the point somewhat; being that in this case there were so many inconsistencies in the person's version of events that it's fairly difficult to give him the benefit of the doubt, of any doubt. If the case simply revolved around a rescue diver not being able to rescue his wife, I think you're points would be absoltely valid. However, it's all the other details and inconsistencies taken together, that really damn this chap.