Because Jay isn't just leaving for some job across the country. He will be coaching in our backyard. Does our pipeline from Utah St dry up? (Robinson, Lapuaho, Wakely, Hillstead...etc). Certainly our pipeline from Weber does.
Pouha would likely follow him. Hopefully no players he recruited. Not sure any other coaches.
BYU would then be in direct competition in recruiting with Jay Hill (yes we have more to offer) who has been our best recruiter in the Sitake era. Lots of bad.