WK
Thanks for your reply.
Yes, I have studied the Boeing analysis in detail and have commented on it in previous posts.
The problem with it is that many parts of the analysis are speculation and all too often in this thread it is quoted as fact.
Remember, the position of the ATC "fix" is not known (it was based on a radio call, not a radar position).
The time and position waypoint change was initiated is not known.
The heading and track at this point is not known.
The airspeed and groundspeed at this point, or indeed any point up to impact, is not known.
Hence my questions to Caz.