I refer to Dietrich's "Bottleneck-Effect", also to be found in my book (check
check http://www.shaker.eu/Catalogue/details.asp?ID=9796807&CC=29432&ISBN=3-8322-8233-5
or www.aero-lingo.com )
Of course, if you want to find something to be blamed after an accident you surely will found something - Human Factors has turned out to be very inventive. (95% was indeed just an estimation of mine). Franz