Atriox wants for his brothers what he never had under the orders of the Prophets, freedom. He is looking to create a society with the absence of social classes, money, and the state. And this clearly crashes against the methodic, hierarchical way of Cutter, for Cutter order and control is important. About the fact that Atriox let Cutter leave, (I have to say I liked that moment in the campaign, I felt it really strong because if I recall well it was the first time Atriox talks directly to Cutter) that gives you a hint on what kind of leader Atriox is. He knew Cutter was a real enemy, he understood that he could win that day by avoiding a battle. I love this duo, Cutter-Atriox, I feel they are enemies that complement each other really well. I am glad HW2 took the campaign to another level. For me now it really feels like a compelling story which characters have motivations and their bouncing with each other makes a great story to be told. I hope to see them again in the future honestly.