Scheuer notes that the Afghan warlords will take anybody's money - but will breach contract, as their troops did at Tora Bora, when their objectives don't match with those they are purportedly working for.
In short, the CIA had knowledge that we could trust our Afghan allies only as far as we could throw them, but this knowledge was ignored, with the results being that Osama, if he was there, and a large portion of Al Qaeda operatives at Tora Bora escaped through a cordon manned by our Afghan auxiliaries.
So it's not really a case of Monday morning quarterbacking as much as it is a case of trying to tell the coach on Saturday that certain members of his team won't be playing out of the coach's playbook, and then getting defamed for his efforts when he makes it public that we haven't been utilizing our own intelligence product when planning our activities.