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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This is literally the most baseless theory ever because they literally said that Cayde was made of Light. Like actual Light. That the wish only worked because Ahamkara Magic manipulated the light into reconstituting Cayde. This is a MAJOR plot point in the campaign.