There's no group that is more versatile than the offensive line.

The Ravens have experimented with moving Bobbie Williams from left to right guard, Michael Oher from right tackle to left tackle and rookie Kelechi Osemele from right tackle to left guard. Rookie center Gino Gradkowski and Jah Reid have played multiple spots along the line as well.

"We do have young guys that can play multiple spots, and that's the key," offensive coordinator Cam Cameron said. "These are young guys, but these are big men. ... It's nice to have big tackles that can play guard and give us some flexibility."

It has been musical chairs on the offensive line going into the fourth and final preseason game at the St. Louis Rams on Thursday.

Left tackle Bryant McKinnie reported to training camp late and out of shape and has been trying to catch up.

He has been relegated to working with the second unit for a while even though he was listed first on the depth chart.

"To be a backup you have to be versatile. You have to be a guard that can play tackle, a tackle that can play guard," Cameron said. "You better be able to play both guards, at least. And you have to find a guy that can play guard and center because you need at least three guys that can play center."