Apply Occam’s Razor to the Saddam has been killed rumor.
Which is simpler? That this is a deliberate rumor to destabilize and seed doubt in the minds of the Iraqi’s (a clever tactic) or that after 12 years of trying to get Saddam, this objective is successful within 90 minutes of hostilities.
On the other hand, Saddam’s lookalikes are notoriously good, they fooled the odious Haider on his visit to Iraq, when he posed for photos with an imposter.
People are easily fooled. Charlie Chaplin famously lost a lookalike competition against an impersonator and as Christopher Hitchens discovered, some of Churchill’s most famous wartime speeches were delivered by a children’s radio presenter with a gift for mimicry.
It would be very good news, however, if this rumor were true.