On the tape of him walking around--was there any audio? Was he heard speaking? If not, I'm thinking that was a double and he purposely didn't speak so his voice couldn't be analyzed.
I lean more towards the speeches being authentic, but there's a lag time because he moves somewhere else by the time they're released in case we figure out where they were made. If they were made after the war began. The reference to the helicopter is compelling, but did the government claim it was a peasant or the locals? If it was the government, maybe they knew the content of pre-recorded tapes and tried to shape the story to fit the tape. It's a stretch, but possible if it was the government who said it was a peasant.
If he's dead or badly wounded, obviously the remaining ministers would not want to remove that element of fear the people have in rising up in support of coalition troops.
I wonder about the Republican Guard troops that unexpectedly moved right toward coalition troops and then surrendered--were they directed to do that by someone on the inside of the Iraqi government, someone we've turned? If so, I think it's possible we do know Saddam's status and just aren't saying.