I'll say it now, Cayde-6 needs to die to bring some conviction back to the story and give the player some reason to fight. But, if we have to have the ghost talk for the guardians instead of them actually having a voice and true feelings for the loss I'm afraid it'll just feel empty and half baked.
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Uldren: "I killed cayde, what do you have to say guardian." Guardian: "..............." Ghost: You're going down Thats basically how its gonna go