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.
Although peaceloving and a doctor, M'Benga may have hated the Klingons too much for what he had endured and have become to not become a part of this endeavor.
Although peaceloving and a doctor, M'Benga may have hated the Klingons too much for what he had endured and have become to not become a part of this endeavor.