For those who don't know, the bishop is the local leader of the church congregation, the Mormon ward, equivalent (more or less) to the parish priest or pastor of a congregation. As the explanation below points out, the bishop has two counselors who are basically assistants. (With the amount of work involved in being the spiritual leader of a a group of a few hundred people as a part-time, volunteer position makes having assistants to help out make lots of sense.) Chad's "calling" (volunteer church position) as executive secretary was, if I remember things correctly, not the next most powerful position in the congregation's hiearchy, although it is still near the top, but it is the position that has the next most interaction working with the bishop of anyone except possibly the counselors.
The point of all of this is that while initially I thought it strange that Chad didn't want the deputy to call the bishop, thinking about it in light of the relationship that the person in Chad's church position would have had with the bishop makes it seem less strange. Odds are good that Chad wanted the bishop to hear it from him.