I've said it a few times, but Flash actually works best for this kinda story. The Rogues. They've been known to work together in the past. Having each of them take a shot at Flash for a few episodes is a great delivery device. Then have them come together for a master plan for the last four episodes. I think there needs to be -some- thread continuing through the season. Agents of SHIELD did it really well this season. The Darkhold. It was a single tie between Ghost Rider, LMD, Agents of Hydra etc. All for a number of episodes.