I do not intend to be condescending to anybody, but unless your involved with the 'investigation team' none of you know what your talking about, ...... in this instance!!....
.....Or in the aftermath of any future incident. Sitting at a computer that may or may not be in the comfort of your home is no place to be speculating about the cause of an accident/incident.
If you have expertise in the area of accident investigation, please feel free to comment. However those that do, generally stay mum until all the facts have been discovered.