It's not like it matters, the CIA did it's job and prevented the threat. Even if the agent was turned, it would hardly mean the CIA failed, as they had intel on them from the start and they were isolated. From the 'facts' we do know an airplane did not explode en route to America. I struggle to see hhow the CIA are even 'involved' with the plot, they just did their job of preventing the attack, and succeded.
This story would only have been of any interest if the agent had a) been turned, and b) actually succeded.