golly that was untidy. The QAR data will tell the full story, the continued flying and delayed reporting will have lost the DFDR. Doesn't sound like a W/shear event, it does hint of disorientation, and crew input resulting in the dive and recovery. The report of going through an extra flap setting is not that big a deal on a B777, for that setting, getting rid of the LE slats would be a bigger problem, in the absence of evidence, that may have been more of a problem, but the B777 will tolerate a F5-F1 error without becoming catastrophic. The response seems to be from the flight crew, not the weather, if the GS has any validity. Not a nice day out.