OK, so what I think happens is pretty simple. Kelmommas is infatuated with Esement. That's all he cares about is his moms love. And, the tunnels that Kellhus built where obviously built for a reason. Tada, those are Kelmommas's personal playground at the moment. All it would take is for the WLW to come to Esme's room to murder her, and Kelmommas be keeping an eye out for such a thing. You have to admit he's pretty handy with that skewer. And, its funny you mention Yatwer would have to be blind to it, he's already murdered Yatwer's head priestess.