Was thinking further on this.
I imagine that Yatwer must periodically make certain 'consecrated' followers 'disappear'.
The text goes to length to show that WLW's when distant ancestor attracted Yatwer's attention. I assume the Ceneian woman was the first of his ancestors to dwell in Yatwer's realm on the outside and that this is important in Yatwer influencing the destiny of her antecedents.
Although the gods don't experience time in a strictly linear fashion, the WLW is clearly a reaction to Khellus (it would be easier to strike from the outside before he became so powerful).
So maybe Yatwer (and probably the other gods by extension) has 'historical blindspots' (such as entire families killed - minus a usable 'gift') arranged every generation or so, just in case.
Either that, or Yatwer altered the past in her favour through her followers.