He was the first Exo, maybe the only Exo...?
That got the upgrade.
Maya wanted to use SiVA, in part, for integration into Exos.
That evolution is called "Quicksilver".
The Cayde we met in the Pale Heart was made out of Quicksilver Nanites.
That's how he healed our ghost.
That's my theory.
😇👍💠
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At the start of final shape, ghost says he’s “maybe entirely of light”