If you payed attention to what Cayde says after you approach him, you would have heard him ask you to take him with you, he wishes to go with you, and even just say to you that he hates his job.As he was a guardian before being put to work as the vanguard, he clearly misses being able to go out to fight of the darkness.So I think it would be cool for there to be a mission in destiny 2 where Cayde begins to fight alongside you in one part of the mission to the end.Or perhaps there would be a cutscene where you are surrounded by to many enemies and Cayde rushes to your rescue as a bladedancer.Just an idea, tell me what you think. Edit:The story behind the mission is that you have been sent to back into the Vault of Glass because the vanguard have been detecting a strong signal that is similar to Vex but not exactly the same.So you have been sent to investigate.When you finally reach the exactly what was giving of the signal, what you come across is Vex who have fused oracles into themselves to give themselves new powers and completely change their appearance.