Mainly, the Bearcats coaches he left behind.
According to reports on Rivals.com and ESPN.com, Kelly's new coaching staff at Notre Dame will include several current Cincinnati assistants.
Assistant coaches Bob Diaco, Charley Molnar, Mike Elston and William Inge will reportedly join Kelly and the Fighting Irish.
Diaco will be named the defensive coordinator, and Molnar will handle wide receivers. Elston will manage the defensive line, and Inge will handle outside linebackers.
The reports suggest that Molnar may also be named offensive coordinator.