Ah but remember a little someone called fel winter???

Felwinter was different in that he had a physical body, and his code was never deleted. None of us fully understand how Exos work, but we know that their consciousness can be brought back by a Ghost in the same way that a Human or Awoken consciousness can. Rasputin had a physical body in the Helm, yes, but I think because the code was fully deleted it would not be possible to bring him back. That experimental Exo body now has no consciousness, and Rasputin’s code has been removed from all its hosts. Felwinter was a computer programme who died as an Exo. Rasputin, to put it bluntly, was a computer programme who died as a computer programme, since he was removed from the Exo body before the Aurora Sacrifice. Therefore, Rasputin cannot be revived

It's also fair to mention that exos we play are just humans in a robot body and felwinter may have been no different with a simple memory wipe so rasputing could try and understand what was left of humanity. Elsie, shaxx and cayde for example existed before the exo project as real people

Why do you reference Shaxx?

Sorry, ment to say saint 14