I'm not in a position to clarify this and further speculation would not add value. But I, for one, would like to hear more from people who do know the correct answers. An information vacuum seems to have occurred!
That's the way it is sometimes when you always wished that you knew more about a subject.
The good and the bad about this vacumn of knowledge is that the really significant findindings get reported and leak out within the industry while the business as usual stuff remains burried in the logs. That was the way it has been with bird ingestions as well.