Yup very easy, all you need to do is have 3 on each side have one person from the left & right side go in the room to lure both witches out then kill them both, then each group has to focus on both shriekers once their both destroyed the death singer's field is down. Then both groups go in the middle of the room to focus on the deathsinger (g-horn speeds her death quickly), it's good to try to get up high in the middle room to avoid all the knights, then finally once she dies start killing knights till you get the notification of the Crota checkpoint, how is that difficult?