[spoilers] Lucas. Just Lucas.

[Tea Lady]

I just don't think Lucas is bad and is only acting the traitor. Look at the level of contempt he showed Connie when her treachery was uncovered. I don't think Lucas was spouting hollow words when he said he would rather have spent 8 years in jail than betray his country like that. Lucas has just ruined another officers life, probably sending him to jail and unable to ever get another job. I bit like Connie killing Ben. Lucas handed over the Albany file which could have serious consequences for other officers lives and their operations. Connie handed over the (fake) names of the Sugarhorse Agents to Russia. Lucas is mirroring Connie's actions. This is why I believe Lucas is only acting.