Very interesting! I do not have this Heinrich taphonomic paper of
which you speak (reference, please!)
Heinrich, W.-D. (1999). The taphonomy of dinosaurs from the Upper Jurassic
of Tendaguru (Tanzania) based on field sketches of the German Tendaguru
Expeditions (1909-1913). Mitteilungen aus dem Museum fur Naturkunde,
Berlin, Geowissenschaften, Reihe 2: 25-61.
(In English, but with Abstracts in both German and English. Shows field
data for the Tendaguru sauropod specimens.)
Thanks for the informative response Mike. I'll give a longer answer after I
read this post over a few more times, and check my own refs.