The current Tennessee Titans roster has fewer holes on the depth chart than any of the teams I can remember coming through Nashville.
So it makes sense that when there is no glaring hole on the roster, that the biggest concern would shift from the field to the coaching booth.
That is exactly what Bleacher Report suggests in a recent article where they think Arthur Smith is the Titans biggest concern coming into the 2019 season. Maybe even more than Smith himself is the fact that the offense is now on their fourth OC in five years with the only repeat OC being Terry Robiskie.