Arrow’s fourth season has been a return to form. For the most part, it’s been consistently good, with moments of greatness mixed in. But tonight’s episode showed what’s truly possible with the new status quo. “Brotherhood” wasn’t just a strong Diggle-centric episode, it was one that further showcased the menace Damien Darhk, brought Ollie’s political career back into focus, gave the flashbacks the boost they needed and even delivered some of the best fight sequences in the show’s already impressive history. It was a resounding success, in other words.