The same Dallin who left BYU for USU, has posted not good things about BYU along with his wife. You can say he easily hates and has bad feelings about BYU.

Dallin then shared those insights he got from studying film with Crew to his brother/family who is the QB at ASU and gave them an edge up on how our D works. This part I don't think is 100% as I am sure Dallin wouldn't admit it, but given the hate and his feeling towards BYU, I would bet a lot of $$ that he did this.

It has been confirmed by Blaine Fowler whose kids is on staff/helping the D staff at BYU.