OK, I watched his first interview last night about this, and a couple of things came up:
First (and I find this one literally amazing) he said he did not know that this honeymoon trip was going to be his wife's first open water dive....I still find this incredibly hard to believe. When asked if he knew this was his wife's first open water dive, he said "No."
Second, and this is even more incredible, he didn't understand the warning from the operators - that this was a "red" dive for advanced divers only, due to strong current; he said he did not understand what they meant, and didn't ask.
The operators were at fault for letting his wife dive - they didn't check her creds. GW stated, "They were just as negligent as me." For me, that's the end of everything right there. This guy ain't the brightest bulb in the pack - his elevator does not go all the way up. Listening to him, I was wondering whether he graduated from college or not, and if so...how?
IMO, from everything that was covered in the interview with him and others, he was negligent; I don't know if negligent homicide (or manslaughter) was even an option in his trial in Alabama, but that's what he pled guilty to in Koalaland, and again, IMO, that's what he was guilty of.