I'm not too worried. Being a coordinator is really kind of divorced from the actual job of HC. You see offensive and defensive coordinators become HC's more often because their play-calling/system is putting them on the map, garnering name recognition. But calling plays is really at the bottom fo the HC success pyramid.
So the ST coordinator stuff doesn't bother me at all. There are non-play-calling HC's all over the place at both the NFL and college level. If he's coaching in the NFL, he understands football. In short, he didn't cut his teeth coaching kickers. ...