It's been more than 24 hours since I posted on this thread so I hope that I'm not overloading it with me-too stuff.
I may have missed it (I do read every post) but do we have knowledge (plots etc.) of where the seats, bodies, Vert Stab and lavatory door were found in a debris field?
I do feel (based on historical experience) that it is unlikely that turbulence by itself would initiate a breakup of a modern large jet. Thus as allways I think that it is important to keep in mind the possible pilot actions in alternate law.
I'm not much of a fan of characterizing out-of-cockpit crew members as critical to an analysis and/or speculation of theories. Pilots qualified to be in the cockpit should be expected to behave in a consistent manner according to their training regardless of seniority.
After we have gained some more factual information about what happened maybe then we can talk about knowledge based pilot experience.