From the Washington Post.

I can't find the posts for reference, but I, along with others, postulated here that our policy during Tora Bora of letting the Afghan allies do the heavy lifting saved American lives but allowed a lot of bad guys to slip through the net. When you consider that the typical Afghan ally could probably be bought off with a cheese sandwich, this is not too surprising.

Actually, I would have bet that bin Laden had fled Afghanistan long before Tora Bora. I'm now guessing that he is in Pakistan, or somewhere else close to Afghanistan. Maybe even still in Afghanistan, although that would be not his brightest move.

Our policy has changed, as shown by the last big offensive where Americans and non-Afghan allies took the front lines. More dangerous, but much more effective.