I’ve noticed that none of the major DLC’s actually focus on the Assassin vs. Templar conflict. Bonfire of the Vanities is about Savanarola. Da Vinci Disappearance is about the Hermeticists. Tyranny is about Washington. Freedom Cry is about Slaver. Dead Kings is about the Raiders. Jack the Ripper is about… well, Jack the Ripper.
The only DLC that comes close to being about the conflict is The Lost Archive, but that’s more focused on just Clay’s story.