Dubla,
If the bombs did kill Saddam, his location must have been pointed out by someone close to the top. It was important enough information that the US had to alter their entire war plan just to take advantage of the situation.
Possibly the informer was a general bent on taking over in order to stop the war. I dont think Saddam's sons have enough support to survive a coup attempt, esp. Uday. Just my thoughts on it.