Well that’s your head cannon and not the actual story. All of the Kyrian exhibit personalities despite having gone through the trials. People are acting like it’s a complete mind wipe, but it’s clear that it isn’t.
The forsworn are actually lying to their followers about their real purpose, which is to serve the jailor-- not over throw a totalitarian regime. Which by the way is open to reconsidering their way of life as shown by Kyrestia at the end of the Spires of Ascension dungeon who says they will have to discuss if purging memories is really a good practice.