TSB report, read it.
Finish reading the TSB report before asking all these questions and to speculate to much.
Plenty of good info in there. For them who post here, fly the SK-92 you should be looking into your company maintenance and ask if they wore following the right maintenance procedure issued by Sikorsky following the Australia incident. Also be sure you know your systems.
Many loose ends led to this, ask more where we sit now and what can be done in the future more than just not fly over rough water with out your helmet on.