And also, as a sheep has no clavicle, it is the easiest way to detach the limb.

But I imagine a butcher would find himself in difficulties if he attempted to take off a man's arm in that way.

The clavicle would be a new and perplexing feature.

Then, too, a butcher does not deal very delicately with his subject; if he has to divide a joint, he just cuts through it and does not trouble himself to avoid marking the bones.

But you note here that there is not a single scratch or score on any one of the bones, not even where the finger was removed.
Now, if you have ever prepared bones for a museum, as I have, you will remember the extreme care that is necessary in disarticulating joints to avoid disfiguring the articular ends of the bones with cuts and scratches." "Then you think that the person who dismembered this body must have had some anatomical knowledge and skill ?" "That is what has been suggested.