This is something very interesting. In the adventure "Hack the Planet", after we rescue failsafe, failsafe talks about a prisoner that was with her in the network. Who was "a [b]VERY GOOD[/b] listener and [b]KNEW EVERYTHING ON THE VEX[/b] ... Notice how she said that the prisoner was IN THE NETWORK with her.
This is too much to pass down, as Osiris was mentioned too many times in destiny 2 to pass by. There must be a reason why Osiris is mentioned so many times.
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People are debating on whether the prisoner is praedyth or Osiris. Given that Osiris is referred to as a user in the vex network, it would be odd to also refer to him as a prisoner later, especially given that failsafe doesn’t seem to know Osiris when he says thanks.