The successful NFL offense starts with a quality offensive line. The ability to both protect the quarterback and open holes for the running game is paramount for winning games when it matters. The Steelers have gone from one of the best in the league, to one with questions all along the line.
The most expensive position along the line would certainly be the tackle position, left tackle to be exact, but the importance of the tackles has become glaring in the pass-happy modern NFL. The Steelers have their share of tackles on the roster, but this depth chart is not even close to written in stone heading into training camp.