How can we be sure that all the 3 inertial references (attitude) were faulty/lost ? Does the 02:11Z FLR : 341234 IR2 EFCS1X,IR1,IR3 point toward a triple inertial failure or just that the IR2 has been voted out by IR1 and IR3 ? Has aviation history ever recorded a triple inertial failure ?
In fact, how can we even be sure that one IR actually failed ? Even in the Qantas "NAV IR 1" fault report, the IR part of the ADIRU1 was probably not faulty, the culprit was the ADR1 delivering spiky AoA measures (which were not voted/filtered out by the AP despite multiple "ADR1 fail" indications, even after ADIRU1 was switched off).
Jeff