I dunno, Rose's misadventure didn't really make me think of Sybil and the elections. It made me think she's basically addicted to being bad, and being with men, since she couldn't resist kissing the guy she was dumping. The maid's outfit and all that is another symptom that she's probably going to get herself into real trouble sometime soon -- she puts her own pleasure above anything else in her life. As for Rose calling Jimmy 'James', that's all she and the rest of the family have ever called him as a servant -- he is only known as Jimmy downstairs among the other staff. Last season, Carson made it clear when he started that at Downton, he is James to anyone upstairs.
I don't think Mary and Tom are going in the direction of romance. (At least I hope not) They both have a direct interest in maintaining Matthew's vision for the estate, and they can both see that Robert is going to fight them on it. They are allies, as well as family.
I'm "grrrrr" about Edna and Thomas too -- I'm also disappointed that they are turning Edna into an O'Brien clone so quickly. Thomas actually did a good thing getting the nanny fired last week, I thought there might be some hope for him. After Bates saved his job by blackmailing O'Brien, I don't get why he's suddenly aligning with Edna to hurt John & Anna. He already outranks Bates, what more does he want? And why does he care is Edna is happy?
Strange episode. The Cheerful Charlies stuff was kind of thin, and basically an excuse to keep Isobel involved in the story, with Matthew gone. Same with Mosely. He's been a good comic foil but his story is over. Fellowes keeps referencing & bringing back past characters under silly circumstances. He needs to write for the people who are left, and bring on new characters as is needed. At this rate, we'll probably soon be seeing the disfigured Patrick Gordon again, trying to make his claim on Downton. They never did resolve what happened to him after the war, or whether or not he really was who he said he was...