@Opsmarco
We're talking about low likelihood mechanical errors not human error. In such mechanistic error/systems it's always much more likely that a single problem with widespread manifestations has occurred than 2-3 unrelated problems with their own manifestations occurring simultaneously. I think this is what the OP sought to look for a single point of failure rather than numerous disparate but coincidental mechanical failures in a relatively modern and safe aircraft.
With regard to human errors - then yes, often initial errors are compounded by subsequent errors by the same or different persons due to various types of cognitive bias, inexperience and situational factors.