This could be something to monitor. We know that the Titans are potentially interested in hiring a defensive coordinator, something they didn’t have (in name) last season. There’s no guarantee that a hire will be made at all (or they could simply promote Shane Bowen), but there’s at least some outside interest here given the fact that they interviewed Teryl Austin recently.
We know that coaches typically like to hire someone they have a connection with. Most of Mike Vrabel’s staff either coached with him in Houston or at Ohio State.