Captain Riiken - Riiken might still appear later if you kill him, but side with Talia anyway

[Snigaroo]

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A user reported that he killed Riiken, but Riiken still showed up later (in the force cage in the palace, but presumably this would also happen on Telos) because he sided with Talia, and the game assumed that the player wouldn't kill Riiken in those circumstances. There are two quest states to check here, per Goat: one for if Riiken was killed without the player being seen doing it, and one for if the player was seen. Those need to be checked both against Riiken being in the force cage as well as his presence at Telos.

[HuntersRun1]

I've been going through the list of bugs fixing what I can and according to this link this happening is impossible(check Hasset Hunters replies).