When an NFL franchise brings in a new head coach, it is expected that there will be a lot of new faces brought on as position coaches. Typically there are at least a couple of coaches who the new regime keeps around, potentially for their expertise and suitability for at a specific position and how they fit inside the vision of the new staff or maybe due to familiarity and lacking a better option right away.
Either way, some of the Colts most highly regarded position coaches are officially making their way onto other teams. We already saw Joe Philbin leave for the Packers and Greg Williams and Tom McMahon for the Broncos.