Want me to speculate? I'd like honest answers on that too, but the people who were there have all surely been told not to go public. My best guess is that the three divers were all hit by CO intoxication and disability, one sinking unconscious, the other two barely able to save themselves. I may not be guessing correctly or accurately, but the scenario does fit.
That is certainly a possibility and a feasible consideration. However, it was mentioned in some article I read, the initial issue was a mask issue with the cousin. It is also possible that the DI surfaced with the cousin to fix the mask issue while the victim stayed at depth alone. She could have had any sort of issue, including the possibility of CO intoxication, or any other possibility such as narcosis, which caused her to become disoriented or even descended, remove her reg, or other complications.
I don't believe I've ever gotten an invoice or receipt for a tank fill in Mexico or a lot of other places. No, I definitely wouldn't look at the absence of an invoice/receipt as any kind of proof.
It's interesting that the name of the shop that keeps getting mentioned in the media reports keeps getting commented on by certain people defending the shop, and THEN other people comment on the comments. Look at the sequence of posts and it's obvious. Perhaps if they resisted berating the person who posted the article, the shop would stop getting tossed around in discussions. It sounds like they should be dealing instead with the source of the information - the media that is publishing the information about the shop.
Who is berating the person who posted the article? I went back and tried to find the source of naming Sunshine. In all I can find the only reason the Sunshine even came up is because the there was some sort of text message with their name in it. However it doesn't mention if the text was sent prior or after or any detail.
Being from the states I guess I follow our legal system of believing someone is innocent until proven guilty and that any reasonable doubt can be considered as reason for innocence. Unfortunately like many things, those who believe one way will believe no matter what, and those who believe the other will believe no matter what, and those seeking truth and answers will most likely never receive them because of the extreme of the two sides mentioned prior