The only reasonable explanation that I can come up with is that the CVR may contain information that supports the conclusion that the timing and content of weather information transmitted to NGA gave the crew a misleading picture of the actual and forecast conditions at NFI. That outcome would be inconvenient and embarrassing for ATSB and others.
The truly inspiring aspect of all this is the way in which the professional pilot community has united to take decisive action to protect its interests, by arranging the recovery of the OBR equipment despite ATSB's obfuscation.
