I can think of no reason to put the pig bones into the soap vat. Just
makes for lumpy soap <grin>. Actually it makes for lots of protein which
could cause soap to rot. Pigs do make soap, however. Lard is the principal
ingredient. I really think this is all a super stretch trying to connect
the faunal remains, soil chemistry and pit into a single explanatory
framework based on soap. I like creative thinking as much as anyone, but I
don't see this one panning out. Of course, I have often been wrong....
Dan