I shall be saving this thread for my own future reference.
There is one thing which hasn't been mentioned so far regarding break-up in flight and that is unreported, and therefore unchecked, bumps to the aircraft. (I am NOT saying that this is implicated in this case.) This report on
G-DELS makes chilling reading. The pilot knew he had hit something, did a very cursory check then set off again with fatal results. All the more reason for having those seemingly minor bumps checked out by an engineer.
Sternone, as others have said, your attitude to people who really DO know more than you is worrying. None of us is perfect, but if I make a mistake, and I have made many, I acknowledge the fact and try to build on what I have been told is the correct version of matters. As one of my former FIs said (of another student) "I foresee a starring role in an AAIB report for him." You really DO need to think, listen and read carefully. I don't want to hear that you have become another statistic.