As I recall, the transcript had comments that the family wanted with held due to their content.
Also, don't you think it's unlikely any meaningful conversations took place giving the rapid break up?
No I do not think that at all. These folks, and I have met and talked with many of their colleagues, are ultimate professionals. As the castrophe unfolded, their attention would have been focused on surviving the anomolous circumstances. There would undoubtedly be important clues in those exchanges, given that there was time to have any discussion at all.