I would say Anagnorisis. This means when a character makes a critical discovery, in this case he finds out he was sleeping with his mom and killed his father. It also means a change in what a person stood for. He stood for finding who was the killer, and cursed him, only to find out its him.
A. Best the reason why it is not better (even though it sounds right) is because it says "out of the five cousins" there for we are comparing ben to five other people and he is the best.