The ear comparison was the analytical step that transformed visual observation into documentary evidence.

Parker’s choice to focus on ear morphology — rather than on more obvious discrepancies like the eye color or the accent, which Bourdin had explanations for — reflects a sophisticated understanding of what evidence would be most compelling.

The trafficking narrative could explain away the accent and the eye color.

It could not explain away mismatched ear morphology, because the narrative of trauma and captivity has no mechanism for changing ear shape.

The specific claim that FBI agents were the ones who first noticed the ear discrepancy — which appears in some accounts of the case — would make the exposure a result of internal federal law enforcement investigation rather than external journalistic skepticism.