You listed a bunch of recruits that have signed or committed under both guys and in fact one of them (McChensey) is a Bronco commit who I personally know Detmer worked pretty hard to keep committed and made sure he got signed. G&R don’t get any credit for him being there. And Hall, who is obviously the most talented of the current QBs was not signing with BYU, he was going to sign with Utah, and Detmer saved that with an in home plea to his old teammate and buddy Kalen and Jaren which got him to sign with BYU.
That is another story I personally know and have very close contacts to.