It does answer some of the points I made much earlier in the thread about the captain's role here.
Frankly, it had not occurred to me that a shop owner and DM would do such a dive from a boat that was also tending other divers.
It won't be a popular opinion, but making this dive when there were other divers on the boat needlessly endangered those other divers and is one more sign of inappropriate decision-making throughout this unfortunate incident. If the captain had done the right thing for the injured divers, it would have meant abandoning the other group of divers who apparently didn't make any reckless decisions.
It increasingly appears that the captain may have chosen the better of two bad options by not abandoning his other divers, but he should never have been put in that position.
If someone on a dive gets injured and the boat leaves me and my buddies in the water to get them to treatment, I'm perfectly fine with that - we've got SMB's and can float as long as needed. Besides, there are usually enough boats in the water that I expect eventually to get picked up. There's really no way for a captain to know this about me, though, and for some divers leaving them could be very dangerous.