The Devil's Double
Even if you're not a member of any intelligence agency, you notice that the guy who says he was Uday Hussein's body double in real life looks nothing like Uday Hussein. He's heavier set and has no resemblence to Uday physically or in manner.
Why would a guy pick a guy that doesn't look or behave anything like him to be his body double, or twin? Wouldn't he go with a guy that was similar to him to be his double? Anybody who told either of them that they looked alike lied to one of them or both, if there's any truth to The Devil's Double.