Henra do you say that because the failure in this exceptionally complex gearbox was downstream of the gearing concerning combination of engines?
If so
I'm not sure in Nada is the right analysis. For example, if one gearbox has 400 tapered roller bearings and another has 10 then which one is more likely to experience a failure of a tapered roller bearing?
So regardless of the contention that this planet gear was working in an area that would be present if it were a single, it doesn't mean it's nada.
Not to mention that lower margins of critical components to carry spare engines is not neccessarily better.
What is the probability of executing a successful Engine Off Landing compared to the probability of executing a Rotor Head Off Landing ?
Pretty poor i'd say.