Cool idea but if this was to happen the theme of Forsaken would be non existent. Forsaken was and still is a story about loss and how far an individual will go to get back at those who wronged them this is prevalent for us especially as Cayde was our friend but Uldren also was wronged by not only Oryx but also Riven misdirected him making him deluded Hence why Cayde and Uldren’s deaths are tragic and bringing them back would make fantastic symbolism and story telling feel worse.