The most significant thing to come out of Monday’s introductory press conference was that Matt Eberflus won’t be calling the defensive plays, even while the team converts to the 4-3 defense he ran in Indianapolis. There are no issues with Eberflus delegating; many head coaches find it easier to manage the whole of the game while doing so. But Flus still must maintain full control of this defense. He would not be a head coach without his success as a defensive coordinator and not using those skills would be a waste.
Mike Tomlin and John Harbaugh are two common examples of defensive coaches who do not call plays.