Nice job with something that had never been done in the Trek universe. It had the feel of stage play with just two people in the same setting the whole story. And with the flashbacks clarifying what happened earlier, more pieces of the puzzle are added. It had the same feel as the Tom Paris arc in season two of Voyager, coupled with the Michael Garibaldi arc in season four of Babylon 5
and Daniel Jackson pretending to be brainwashed in the final season of Stargate SG-1
Based on what we know from Zero Sum Game, 2378 was about the time Sarina Douglas was recruited into Intelligence and then Section 31 some time later. If L'Haan could so easily use a mind meld to manipulate Taran'atar, 31 theoretically could have immediately gone through with using Sarina to bring Bashir over to their side. Instead, that doesn't happen until four years later, possibly in response to Vaughn's little scheme seen here.