Right from the Sun Times:

"Despite reports that assistant head coach Rod Marinelli would become the defensive coordinator, Smith suggested that position would be filled from the outside. Smith highlighted Marinelli’s importance as the assistant head coach (“Rod has been a rock for me,” Smith said), and he noted that Marinelli has his hands full already. “That’s a full-time job,” Smith said.
Smith said he continues to believe in his Cover-Two based scheme, even though the defense finished 17th this past season. Smith, though, isn’t so set on offense."