I get a warm fuzzy feeling there is something on the CVR we are not being told about...other than that it's hard to really PROVE who made which control inputs, we can "surmise, guesstimate, build a circumstantial case" based on who was making radio transmissions, and the past history of the pilots, but proving it is another matter...the lawsuit may serve to force the company/NTSB whomever to reveal details inconvenient to the family members that are best kept private, in order to defend themselves..