That’s assuming the traitor (I won’t definitively say that it’s Breden) is a Kryptast. They could just be a regular person who is acting as an informant, possibly unwillingly.
What seems most likely to me is that Breden is the traitor, but they aren’t a trained spy - just a particularly charismatic helot the Hegemony flipped to use as an asset in rooting out sedition. Their family or someone else important to them is being held hostage while they are sent away to a different area entirely to reel in the rebels. Explains why they aren’t exactly the smoothest operator at times and do a rather poor job of deflecting suspicion, and also why they get sent to die as well if you don’t try to stop the harrowing. The Hegemony wouldn’t execute an asset as valuable as a trained spy out of hand, but putting down one more helot wouldn’t be a big deal, especially if that helot had outlived their usefulness.