It's not the chin issue that this photo hides (that would be shown by photos of Oswald).
It's the issue of shadows. Clearly an attempt was made to duplicate the stance, but the only reason to remove the head - the only REAL reason ... is to hide shadow detail.
They removed the proof that the nose shadow didn't work.
And no believer in 50 years has produced a photo in a similar stance and under similiar sun conditions that match the BY photos.
When Oswald said that his head had been pasted on, he was surely simply telling the truth.