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How, precisely, has hypoxia been ruled out?
Noises of shouting, banging on the door, screaming from pax, clearly audible captain's voice from outside the FD - multiple sources show, IMHO, that Hypoxia can be ruled out BRD.
Doesn't mean the aircraft wasn't depressurised or slowly depressurising or filling with smoke - those banging on the door could have had either toilet masks or portable oxygen masks on between shouts and they could have been wearing PBE.
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How, precisely, has incapacitation been ruled out?
Deliberate selection of an ALT below MSA and deliberate actions required by the F/O to keep the FD door locked out after the 5 mins are up - rules out his incapacitation BRD.
So an Airbus has never done something that isn't in the manual? Yeah right. So it's completely impossible that an FMA glitch changed the altitude? Or that the remaining pilot wound it down for some other reason?
Incidentally who that flies the A320 knows the time periods that your airline has programmed into the door system. What's the time delay after you enter the emergency code? I bet most of you have no idea. If you enter it again before the time delay has completed, does the time start again ... ? How familiar was the Captain/crew with the way the door system works?
It's perfectly possible that the aircraft had a different code programmed to the one the crew were trying. How often is this tested in your airline?