Yeah, it's really ambiguous if you got the good ending with Jaethal.
The relationship between Jaethal and Tristian as it pertains to endgame is really, really obtuse. One of the frustrating things about Pathfinder is that you don't know if the consequences are a result of your decisions or it's because something bugged out along the way.
I still tried to get as much of a completionist run as I could, but I failed to get the secret ending and I failed with Jaethal, and the latter had no obvious reason why.
Coincidentally, the latest beta patch also changes the chapter 4 split decision. To explain the history of this decision and why it was hugely problematic (beyond being 'I hope you knew about this beforehand or else your party might get -really- screwed over at endgame' levels of bad design), it's basically gone into three phases.
Edited by Saito Hikari, 29 December 2018 - 02:36 AM.