Sac State's bid for the Pac 12 Thread They probably keep in contact w recruits they connected with but didn't sign, as well as star camp attendees.
He's in high demand, and the early moves are completely understandable. Coaches like him, Nathaniel Hackett, Khari Jones, Burl Toler, Gus Argenal (basketball) move, learn from lots of people, absorb, and move on.
Up-and-coming African American coaches are in especially high demand. It's easier, and more visible, to hire a black coach than a black chemistry professor.