Of course not all the circumstances involved in the crashes can be publicised, sometimes for good reason.
Some of the blacked out portions will no doubt to be to save face for the MoD and it's it possible they dont want anyone thinking corporate manslaughter/negligence in some/all of the cases.
It speaks volumes that the SAS are just to be banned from Pumas (if the report is to be believed), if they are so gung-ho, they'd have been banned from all helos. This suggests that the airframes did possibly play a part in all the crashes.