"...does seem a bit strange why the pilots and Boeing are still keeping quiet? which makes you think that the crew made a bit of a hash of it..."
Perhaps they have nothing of value to add at this point, while the investigation continues?
(Some people do remain silent when that is the case.)
I certainly can't agree that silence equates to any sort of probable fault. Even the fire-handles/fuel switch order of precedence issue looks to be more about allowing ambiguous (by process) timing of two independent activities by two actors, rather than a unique human error by this specific crew. In addition, the quirky wiring (prior to the directive to rewire the switch power) is a contributing factor to that (minor, in this instance) issue.