HH6,
You're no dummy. You know that they left the northern road out of Tora Bora umbombed and unguarded for a reason. You know they let 1000 cars leave in the middle of the night, and let Osama get on a plane to Egypt. You know this, because at the time, the generals were on the news going APESHIT, upset and complaining AS IT HAPPENED.
They don't make mistakes like that. Our military can kill anything once we have it surrounded. Osama was useful for other things, so they let him escape.
I'm betting he'll be caught/deaded in October to put the hat trick for the Afghan/Iraq victory declarations.