The Steelers' depth chart looks nothing like it did when they finished the season against the Browns more than three months ago — and nothing like it will when they open the season against a still-unannounced opponent in a little less than five months.

Even after the most extensive free agent-driven roster reshuffling to date for the Kevin Colbert and Mike Tomlin tandem, with seven players arriving via free agency and nine departing, the Steelers have significant lineup holes and depth issues.

They are not exactly tearing down and starting over, but there is a lot of renovation.

There's still no certifiable wide receiver starter to complement Antonio Brown, so unless second-year receiver Markus Wheaton has a big training camp, a starter could emerge during the first or second round of the NFL Draft on May 8-10.

And will the draft produce a starting defensive end now that Ziggy Hood has signed with Jacksonville and Brett Keisel hasn't re-signed? Cam Thomas, a nose tackle with the Chargers, could play there, but the Steelers haven't had many 330-pound ends in Dick LeBeau's 3-4 system.

The offense looks to be more settled now that LeGarrette Blount is backing up Le'Veon Bell at running back, Darrius Heyward-Bey is around to provide a speed option on long-yardage downs at wide receiver and Lance Moore replaced Jerricho Cotchery as the slot receiver. The majority of the depth-chart gaps are on a defense that keeps getting younger but at least for the moment doesn't look any better than the one that finished an uncharacteristically low 13th last season.

For the moment, they're better than before at running back and safety but thinner at wide receiver, linebacker and the defensive line.