The source being clandestine in nature has raised more than a few eyebrows, criticisms of the "burial" notwithstanding. Intelligence services have aided and abetted many lies and manipulated many agendas over the decades, I'm afraid we have to favor healthy skepticism here.
The movie was a piece of shit, and pales even further without 3rd party confirmation of the actual execution, nevermind the capture itself. I'm not saying give him a trial, as that would be a threat to national security, but at least some chain of custody outside of the CIA would have been really nifty and cool of them.
And it could have worked wonders for this story.
kudos
The fact he wasn't droned along with the 1,000 other people who were droned in the region that year speaks to something being amiss. He was an intelligence asset, anyone who understands what that means knows he would have been rendered, not killed. That is why boots were put on the ground. That is why he wasn't droned, because intelligence assets aren't summarily executed-- they get rendered. Tossing him off a boat just doesn't jive. The community knows that but aren't free to speak their mind.
So I just did it for you.