Two comments -
RR engine data :
Given the vagaries of HF radio propagation it is entirely possible for Fort Meade to have received signals which did not arrive at RR. A simple issue of antennas in different locations. In any event I would not expect RR to make any public comment for contractual reasons.
Cockpit windshield failure :
This is a possible cause which we have not considered. Such events are rare but they have happened. This would cause explosive cockpit decompression and incapacitation of almost certainly at least one pilot.
With the captain incapacitated and the FO probably injured the shock and startle effect would leave a less experienced FO with a serious workload problem.