As I said in an earlier post on the same subject, if the investigative authority has the sequence of event fixed on the FDR, witness reports that alter this sequence are generally diregarded, as they are subjective ( I was explained once that the biggst shock one gets when witnessing a crash is often the explosion, this is what the brain recalls , and the brain tend to place this event before anything else when it stores it on the long term memory part of the brain,if the sequence of event is very close to one another )
In our case the Airbus FDR used was one of the most sophisticated around recording hundreds of parameters. Surely the NTSB has determined the correct sequence of failures by now.
As to the cover up, if it was a terrorist atack someone in the middle East would have claimed if not responsibility , at least knowledge,and nothing came up that way in any Arab media as far as I am aware. Unless of course this was the act of a loner US citizen ( like the Tampa copycat last week )
Finally as to why Airbus sit tight and say nothing, this could be explained by the fact that they are planning to switch most of their manufacturing in the future to composite. Most of the A380 will be made in composite, including parts of the fuselage...
I agree that if they had the slightest bit of info indicating it could be a terrorist case , they would probably have leaked it to the media by now.
I also trust the NTSB will dig deep and find the cause if they can.