Given Ken's analysis I would say the important part wasn't the check in but, as Thal pointed out, not spotting him when he surfaced. Even if the boat could not move to collect him immediately they would have known where he was and been able to get him faster. The check-in failure to me shows how negligent they were, i.e. if they screw up a simple check in then they probably weren't paying attention to the surroundings to look for divers as they surfaced.
IMO Ken's analysis wasn't to absolve they boat and crew but instead was to mitigate the damages. All it was doing was saying "if the check-ins had been done what would have been the likely procedure and how long would it have taken to find him". It is all about figuring out what damage was actually done by the boat/crew's actions.
Ken's reply to Thal;
Thalassamania wrote: "I would differ, and respectfully submit that the first breach of duty occurred when the diver surfaced, blew a whistle and waived and was not seen by anyone one the boat."
Not an unreasonable assumption but there's a great disparagy about where Dan surfaced. He changed his story at trial from what he said at his depo.
At trial, he says he was 400 feet from the rig, the boat was between him and the rig 9so maybe he wass 200 feet fr9om the boat), and - on a diagram he drew in court as an exhibit - he was due north of the rig, more or less between the NW and NE legs. However . . .
The current was moving west-to-east. Dan's claimed position is 90 degrees perpendicular to current direction. I fail to see how he could have drifted 90 degrees perpedicular to the current.
Based on his previous testimony and his statements of being near a large mooring buoy (which is 1039 feet away from the NE corner of the rig), and based on the speed of ther drift and the time he was in the blue with no reference, I think Dan surfaced roughly 1100 feet to the east of the rig.
This is an area where (1) no diver has ever surfaced before, and (2) is nowhere near the area surrounding the rigs where you'd reasonably expect anyone to be watching. It's essentially waaaaay behind the boat and nowhere near the dive area.
It somewhat like me saying we should meet in Maui but then I go to Kaui and wonder why you didn't find me. They're both Hawaii, right???
Also, a staged picture (that I took) was entered into evidence of a diver in the water with an inflated safety sausage. The diver is 1100 feet from the rig and the boat is on the NW corner. The only thing visible in the picture is a black speck, and you have to know to look for it. Point is, this idea of blowing up a safety sausage means you'll be seen isn't necessarily true.
So your general premise of duty is fine had Dan surfaced that close to the boat but I just don't think that what he testified to in court is what actually happened.
- Ken