Staike was a big reason for a lot of them committing there.
Also seems obvious KWHIT wouldn't mind leaving if he found the right opportunity.
Don't get me wrong. I doubt their program flounders. They still have the advantage of being in a P5 and recruiting more athletes to a proven defense system. Offensively I would be much more skeptical if I were a recuit and I don't think they can bridge the gap to the upper PAC12 offenses.
As an aside, Yewtah gets the reputation for being able to incorporate RMS who want byu experience in a football setting, though in reality it is sort of an antiMormon party school. Very liberal.