I am flattered and sad. My apologies - and the apology is not an excuse - I enjoyed writing Durance very much (and the Grieving Mother), and I poured as much as I could into those characters to be the best they can be.
Spoilers Follow
I do feel that both suffered on my part because the GM is naturally divorced from the environment and I used my particular node count editing pass with Durance to make him more diety-grumbly with the player rather than more hooks in the environment. That said, the original version (which may still be intact in the final sequence, I haven't played all the options) did allow for Durance to still "believe" in Magran, and there was an evidence chain for Woedica for Magran - you needed to be aware that Durance's soul had been "sheared" by the Grieving Mother (and that's why Magran seemingly turned away - it was harder for him to be seen by the goddess because soul-wise, he was a different person) but I believe this was changed to the Godhammer explosion instead. His staff was also supposed to give evidence of the "truth" of it, since while Durance's surface thoughts and rationalizations would allow for his own explanation, the staff's symbols don't lie.
Also, while I knew there would be a Woedica revelation, to play to the Magran "ignoring" Durance during that sequence was a weakness that I should have hammered home more in the dialogue.
So yeah, I could have done better with that, and I apologize. Overall, any quest with Durance should not have left an open loop if he chooses to still believe in Magran.
My hint with the character was that Durance could eventually "avatar" himself like Eothas because he was so maddened by the betrayal and either take on Magran's aspect or even Woedica's aspect since he desired justice so strongly. I thought both the Grieving Mother and Durance would make excellent villains/antagonists for a sequel, but I wasn't involved with Pillars after the core release.