analyzing the report now. It will take time to ensure an accurate factual statement is posted as sequence and consequence must first be accurately determined.
One point for you to think about however. Under normal circumstances the ADR (air data) part of an ADIRU is suceptible to external influence. The IR (attitude) part however is a completely self contained unit that requires nothing more than power for it to operate and is not susceptible to external influence.
34-11 covers all air data sensors but one interesting aspect is that pitot probes 1 + 3 are close together on the fwd left hand side of the aircraft near the radome. Pitot probe feeding ADIRU 2 system is on the right hand side and I couldn't find any warnings for ADR2. However damage to these probes should only result in ADR faults and not IR faults.