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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Can’t. You’ve now taken a vow of silence until all of the murders have been given the vengeful justice they deserve. Unfortunately, that won’t happen until Matilda year 1 of Destiny 3, if you’re lucky.