I think you may be right. Saddam may well be 'on the wrong side of the lawn'. I didn't think the 'Saddam' filmed with the crowd as the war started was really him either. There was something different about his body. The fake Saddam was shorter or rounder or more slump shouldered that the real Saddam.
He's dead Jim!
If one goes back to earlier news footage, Saddam is very old, and was very weak. He had cancer. He was holding a rifle up and shooting it as he does each year. He was barely able to hold the rifle up.
I believe he died soon after that. That was at least a year before the coalition strikes, and the intell-community has not seen the real Saddam since.