Engines perfectly worked for 11+ hours.
Plenty of fuel available.
What caused this incident remains a mistery.
It could be even impossible to find a final answer through the official Inspectors especially if fuel was fine in quality and quantity: it could be that nothing else will show an anomaly except for the inexplicable loss of power.
If the fuel side of this 777 is all ok, then we are left with an electronic/software issue which could even be impossible to identify or replicate.
I think it would be better/easier for aviation to find out that this incident was fuel related.
Otherwise it is another e-factor, still linked to the low altitude and final phase of flight, which could present "electronic/software issues" which are still quite unknown because extremely rare and so hard to replicate.
The voice recorder will be useless : a series of Sh*t from the moment the engines did not respond! They probably expected to see the plane in pieces behind them.
Well done to the crew, excellent gliding skills. Your landing was perfect.
P.S. Many said 27L has got same stretch of grass as 27R: from Google maybe it looks the same, from the air it seems that they would have touched down on the car park if same incident happened on 27right. The grass in front of 27R looks ~50/100mt shorter than the one where the 777 gently landed but I could be wrong. Distance from the last light to the beginning of runway.