nick14: I think Lon More has pretty well known that - it wasn't really the question
I don't really know about this A/T disc theory - if you go below the GS you'll get the GPWS alert straight away, so I guess you'll notice it, don't you? Not talking about the altitude alerts of the GPWS.
I don't want to speculate, but for me it looks like if it was a normal landing and they just missed the runway. So I would take the possibility of an ILS/GS problem into consideration as well - on both sides, but I'm sure the investigators will check on that.
To be honest it reminds me to the AEA incident at EPKK - they were just lucky enough to make it to the rwy after having destroyed the landing lights... Can't recall though if I've read anything about the reasons of that one.