Faire d'income
Perhaps a more illuminating question might be: "what could cause a triple INS failure? (albeit one of them was disconnected after being identified as failed and the a/c released under MEL). Is it all about the voting integrity of a triple INS compared to the disputational contention of only having two INS/IRS in service.... and those two being incorrectly racked, connected or otherwise hooked up.
What does this incident/near accident tell us about MEL?
Maybe Mono (the Mouth) could elucidate on the likely possibilities - if he wasn't so busy being highly sanctimonious.... and actually knows what he's talking about. But I fear that he's hiding behind that non-speculative stance - as his ilk often do when equally frustrated about such an event (yet allegedly highly qualified enough to be supposedly able to analyze it).
Without some knowledgeable speculation, given the nature of Royal Nepal's culture and Boeing's propensity for concealing bad
PR, the incident will otherwise be lost as a learning experience.