This is truly a sad case. During my most active dive period I was on the larger Sundiver boat frequently, and Ship Rock was one of my favorite sites, although Ray's plans seldom took the boat there. I never had a moment's doubt of Ray or Kyaa's commitment to the safety of their divers, but I do know mistakes can be made as long as humans are humans.
I personally experienced a near leave-behind of a diver (not me) at Ship Rock once. I was on a small boat (NOT a Sundiver boat) doing a 'live boat' dive and was dropped off solo in the early morning. Other divers were dropped off all around the pinnacle, but no others in my area. One of the divers was using a bright yellow rebreather and it caught my attention. The water was very cold (Feb) and I surfaced after only 35 minutes to find no boat in sight. I spent another 20 minutes floating with a harbor seal as a companion before my boat hove around the rock and picked me up. While I was waiting another boat had seen me and signaled to ask if I was alright. I gave the 'OK' signal but also got the message across I was looking for my boat. Knowing that boat was there was comforting, since I had weighed my options in case my boat didn't return and wasn't thrilled with any of them.
After my boat picked me up, I was told I was the last pick-up and we were heading to our next site. The boat drifted away from the Rock as we de-geared. Just as the captain was firing up the engines I noticed the yellow rebreather guy wasn't there, so I asked loudly where he was. The captain said something like 'Oh ****' and he started the motors to go the short distance back to the rock to look for him. Just then we saw a skiff running toward us with our yellow rebreather guy in tow. I don't remember for sure but I think the skiff was from the same boat that had spotted me and asked if I was ok.
And here is the point about humans making mistakes: the boat I was on held only six divers that day (it could hardly fit any more), was run by an experienced captain, and yet still nearly left a diver behind. If that other boat hand't been there to pick him up when we didn't and I hadn't been fascinated by that yellow rebreather enough to remember and ask after him, what might the outcome have been?
The cause of the situation I experienced was easy to figure out. The small group of divers - all very experienced and most of whom knew each other, created a relaxed atmosphere where strict checking in/out of the water wasn't thought necessary. But that attitude was clearly a mistake.
We may never know what transpired in this current incident, we can only hope the local industry learns from it and so does the dive community. But while learning we must also remember we are all responsible for safety and we are all humans prone to mistakes.