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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Hate to say it but I highly doubt we will be getting our voices back. Instead the annoying little light will be doing all of the talking for us :)