Just finally beat Dual Destiny with my friend. We chose peace at the end, which resulted in us getting placed back in the arena and nothing else happening whatsoever. We did not receive the Exotic Class items at all. We shouldn't have to run the mission again just for the chance to get our class items that we already earned to finally drop. Not really sure what to do considering we spent a lot of time figuring out this mission and completing it just to get absolutely nothing in the end.