Separately, Shalash knowing Ishar can modify the Oathpact to put the burden of imprisoning the fuse in Braize on one person, is looking for a candidate (i.e., Gavilar). Only after Yezrien's death he finds out that is not possible. From Kalak's writings we find out that he believed he can leave Rosharan system using a large gemstone. Hence the cooperation between Kalak, Nale and Gavilar in forming the Son's of Honor.

However it seems some of the Heralds (Kalak, Nale, and in my opinion Ishar and Shalash) knowing the coming of the True Desolation, have been planning to change the Oathpact so that they won't have to return to the Damnation.

Prior to the assassination of Gavilar, we already know that nine of the Heralds have done everything possible to save themselves from the Damnation even if their actions undermined the Oathpact and caused the return of the Desolations. Having reread the entire series this past week and re-listened to the SA5 prologue I have come to certain conclusions regarding Heralds, Stormfather in relation to Gavilar as well as the duel between Dalinar and Taravangian's champion.

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