I am wondering if this is going to be a repeat of a tactic we have seen before... "get thee under the bus instructor and take one for the team...by the way we sent our first round draft picks to help the other team "
The instructor was running the class, not PADI. Every instructor knows that you can't apply direct supervision to 3 students in an open water environment at all, let alone during the FIRST ever dive. As an instructor you are not permitted to leave a student unattended at all (let alone for 30 minutes). The onus is on the instructor to run the course in such a way that this cannot happen.
This instructor did not do that, which, by definition, makes his approach flawed. Standards say, in essence, "don't let this happen" and he did. That's not throwing the instructor under the bus. He has to account for his own decisions. PADI is not responsible for the individual decisions of instructors any more than the president is responsible for the individual actions of police officers who break the law.
So what happens in these cases is this: Keep in mind, I'm, not a lawyer but from the sounds of it neither are most of you so I'll try to explain it as best I can in layman's terms:
First of all there will be an investigation about the situation to determine if anyone has committed an actual crime. For example, criminally negligent homicide that could land the instructor or his employer in jail. In a handful of cases this actually leads to criminal charges. I think at least one of these cases was discussed at length on Scubaboard. There have been one or two cases of one buddy murdering the other while diving and trying to make it look like an accident, for example. This needs to be ruled out first.
Secondly, there will be an investigation into how this accident happened. PADI's defense (as always) will be that the standards are not to fault because the standards explicitly tell the instructor that he cannot leave a student alone, which obviously he has. This is not throwing the instructor under the bus, this is a rational finding that the standards did not prescribe actions (or lack thereof) that lead to the accident. In other words, this accident did not happen because the instructor followed standards. This is a normal step in all of these cases.
This DOES lead to the instructor twisting in the wind, at which point liability will be determined based on connecting the dots between duty of care, a conscious action (or lack thereof) that precipitated an accident and the actual physical harm involved. I guess you can see this as the part where they lay blame but it's logical to look at the instructor for this because it is the instructor who has the duty of care for this particular students, nobody else.
If the instructor plays it smart then they can pull their employer over the cliff with them by blaming the employer for the instructor's inability to fulfill their duty of care. I've actually seen that happen. It's messy and there are only losers but at least the instructor can deflect blame to some extent by doing this so they may be able to work again in the future.
My understanding is that deciding who is to blame (settling the question of liability) is required for the next step, which is to sue for damages. This can be a long process but if at the end of it all a cash settlement is awarded then the insurance companies (true to their business model of "whatever happens, don't pay") will try to tie it up in legal voodoo until everyone involves dies of old age. We hear about large settlements being awarded but when have you ever heard... I mean REALLY heard of a case of the insurance company actually paying it out? This is all to say that all the talk about deep pockets and naked chickens doesn't really matter because in reality, even if you ARE awarded damages, you'd have better luck getting snow to burn than you would getting the insurance company to actually take it's responsibility and do what the court ordered. This is the main reason that people settle out of court.
tldr;
So if you made it this far through the post then you'll see that there is much more to this than just PADI cynically throwing instructors under the bus. The instructor Effed up and ultimately the instructor needs to answer for it.
R..