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huh weird... if you got the butler route & asked all the questions you get fake jestyn (who is actually prieston disguised) saving you which leads you to prieston's route. i only got real jestyn saving me when I skipped getting to know butle

You have to do all those steps, but you have to do Wizzy's room before Knighters room, in order to unlock additional dialogue from Knighter when speaking to him.
The order I did them in to unlock it was:
1 - Crownus room multi click
2 - Wizzy's room & interactions
3 - Knighter's room & interactions
4 - Don't Follow
Doing them in Knighter → Wizzy didn't unlock the Prieston route for me, but doing Wizzy → Knighter did.