so it would be interesting if Xykon ends up getting killed in this dungeon. He would return to his phylactery to regenerate, which means he would discover Redcloak's deception. One of two things could result:
A) Xykon kills Redcloak, making Jirix the high priest, and he might be more open to Durkon's offer.
B) Redcloak flees after Xykon discovers his treachery, and being out of options, he goes to the OotS chastened and more open to negotiating.*
*I recognize that these are longshot possibilities, as the logical thing for Redcloak to do if Xykon gets killed is to destroy the phylactery before Xykon can regenerate and kill him.