I hadn't heard that the five had pledged to only do charity work from the day of their release on forward. But what does it matter if they had? Nobody would have believed them anyway. So, even if the released detainees are not necessarily inclined to want that life again (they ARE older, after all), I think everyone in the administration is sophisticated enough to understand that they're going back into the same environment as before. And even like a drug addict who wants to reform, going back into the same environment will probably lead them back into the same life.
But I have a sneaking suspicion those guys will find that the NEW leaders won't necessarily be willing to give up their power and just step aside to let the old guard take over again. As a general rule, human nature doesn't work that way. The new leaders will also be suspicious about what the former prisoners may have revealed to the Americans about their operation. After an initial happy reunion, I have a funny feeling there's gonna be some tension as personal ambitions and suspicions take hold. No doubt something to this effect was included in any briefing to the people who make the decisions. And in true Psy Ops form, it also wouldn't surprise me to learn that American operatives have spread some seeds of distrust in that regard in the hope that some of those seeds might just take root. I mean, haven't you even considered the possibility that they'll just eventually kill those guys when they get back to Afghanistan? Maybe it'll be because they don't trust them. Maybe it'll be because they want to take over and the new guys in charge don't much care for that idea. Could happen. After all, life is cheap there, and there's no real law to hold them accountable if they do kill them.
So, here's the scenario. One day, Sahib and Farook go out for a camel ride, and in something akin to a Mafia hit, Farook doesn't come back. Some predetermined story is cooked up beforehand and then dished out as an explanation. Then, everybody says a little prayer to Allah, and they all go back to the way things were before the guy came back.
Then there's always the possibility that a predator drone may find them at almost any hour of the day or night about a month from now. Bye bye, Farook!