Considering M'Benga's PTSD and his potential murder of Rah, I think it's very probable that he was part of the Federation/Klingon conspiracy in TUC.
As I mentioned in the episode thread, the young Starfleet Ensign who was healed and sent back in with the SOF unit reminded me very much of a young Admiral Cartwright. It would have been interesting if they had made him that, and then let him live through those events. It definitely would have given him some motivation for joining the conspiracy in TUC.