ECUK have assured us that there will be a thorough and detailed investigation "no matter how ugly".
Last week 4 engineers were suspended pending interview with the AAIB.
I don't think we should second guess the AAIB - but I have a personal opinion! as discussed earlier if there was even a hint of mechanical failure then we would not be flying now - I would hope anyway!
I have heard a rumour that the control rods had to be disconnected during the track and balance. To allow one of them to be removed the scissor link nut needed to be removed - draw your own conclusions.