I mean, if the crashes were due to a single cause, that cause should probably be either the failure of the last backstop, or the failure that started the chain.

I mean, if the crashes were due to a single cause, that cause should probably be either the failure of the last backstop, or the failure that started the chain. IMO the start of the chain would be the AOA sensor failure, and the last backstop would be the pilots running through the stab trim runaway checklist... That doesn't get him settlement money, though.