A grain of salt
I would take these stories with a grain of salt. While I wouldn't put it past the Bush administration to manufacture a story around Saddam's capture, I don't think these stories carry much credibility.
One reason I disregard such allegations is that there is literally zip motivation for the Bush administration to make something up one way versus another. We would have eventually caught up with Saddam one way or another - all that remained unanswered was when and how.
Frankly, this story probably holds about as much water as Mr. Bush's claim that Iraq had weapons of mass destruction.