It would appear from this
Tulsa World article that Coach Holder receive the credit from Gundy for being able to keep Dunn.
Gundy on receivers coach Kasey Dunn: “We were extremely fortunate to keep Kasey Dunn. (Athletic director Mike Holder) did a fantastic job of building a contract and a package — a long-term deal — and, essentially,
recruiting him. Kasey wanted (a promotion). He wanted to be the coordinator, so I wasn’t the most popular guy with him at that particular time. That’s life. That’s the way it is. So, coach Holder basically did a fantastic job of keeping him here.”