I have just read the transcripts, here are some points which I have not seen covered yet:
1. The police interviewer - denoted "Lawrence" is clearly a diver since he uses the correct terminology throughout the statement and asks sensible questions in the correct context.
What specifically made you think this guys questions were so good?
2. Watson had been to 150 feet at least once, and used the phrase "narked" in that his instructor wanted him to experience being narked at that depth.
Very little was said about the dive. I couldn't fit it into any training context that I'm familiar with and I was also an IANTD advanced nitrox instructor. He didn't even know what his bottom time was and I don't recall anybody asking about gasses, decompression or anything else that would have told much about the dive. So. he did a 150 ft trust-me-dive once to get narced on purpose? Sounds clueless to me.
So?3. He was certified in 1996.
I don't use any conputer but what makes you say that he lied about the battery?4. He used an AI computer, and he lied about the battery issue.
I never used a lift bag in a rescue class but they are certainly ised in the AOW course if the search and recovery dive is one of the electives. Experienced?5. He has had training in the use of lift bags
6. He is a spearfisher
I spear fished on my very first dive which was more than ten years before I was ever certified? So?
7. He talks about air embolisms
And you need to be an experienced diver to have heard of an embolism?
For me, points 2 to 7 help add to the picture Watson is an experienced diver. It doesn't conclusively prove it, but he had been certified and owned all his own equipment for the 12 years, has been deep diving experience, knew about narcosis, had been to Cosumill (presumably Cozumel), has had his gear serviced yearly, had used lift bags, knew what an air embolism was and had been spearfishing on scuba.
All these help been to dispell any myth he was a novice, in my view.
I disagree especially in light of the outcome of the dive.