re CVR lost: has crew conveniently developed amnesia.?
well no, but this whole incident (very serious as it was, almost a Tenerife x 2) I reckon will see findings to be mainly down to Circadian low effects and v.v time zones rosters commuting etc etc (IF we are ever told and shared this info)
This is causing fatigue, mind fixations, - ie: I'M VERY TIRED
maybe the CVR was wiped or simply got forgotten to be saved as implied by my above comment(s)
just my 2p