An interesting Theory 2K and I'm always open-minded enought to be re-educated should I be proved wrong. I'll be honest and say that I took my workings from this..Not strictly true. Whilst in the vast majority of cases the size of the pelvis/spread of the shoulders does make it easy after "one look" there are many, many other long gone cold-case-corpses that still can puzzle even experts of pathology once the corporeal covering has long gone. Even with DNA testing.
There have been many "slimly built, slender males" that, once the "worms have eaten the bits" would be hard to conclusively confirm as "male"
Similarly there have been some "stocky females" (even nowadays seen in ladies rugby) who, in physical build at least, could pass for a "Chiefs" front row forward.
Male or Female?
naturalhistory.si.edu
I admit that I've spent very little time ferreting around in trying to prove my point therefore I wonder if you might be able to highlight cases where the police and pathologists have failed to make an identification.