NASHVILLE, Tenn. -- Heading into the season, we thought the Titans had what should be a solid offensive line and a quality stable of weapons.

Things haven’t panned out that way for Tennessee through seven games, where the underachieving line, the inconsistent receivers and the largely rhythm-less running backs haven’t made things especially easy for the quarterbacks.

Zach Mettenberger is the new man running the huddle for the Titans starting Sunday, but what he will be surrounded by is not regarded as nearly a good as it was at the start of the season when Jake Locker was the QB.

Per Sam Monson of Pro Football Focus, the Titans rank 20th in the NFL in supporting casts.

“The Titans could have been a whole lot better on the offensive line with one simple move: switching starters at right tackle. They were forced into starting rookie Taylor Lewan when Michael Roos went down hurt and was lost for the season, but the Lewan-Roos pairing should have been the starting duo from the outset, because Michael Oher is clearly ill suited to the scheme and is struggling at right tackle. Delanie Walker has been a bright spot at tight end, but the passing game is floundering, and there has yet to be anybody to emerge from the directionless backfield by committee to demand a featured role.”

Oher has not been good. But I don’t know that it’s fair to single him out just because the Titans had the most viable alternative to him.

PFF says Oher is 67th of 72 tackles in the NFL. Lewan is 12th, and Roos was 17th.

Right guard Chance Warmack is 45th of 75 guards and Andy Levitre is 60th.

Center Brian Schwenke is 39th of 41 at his position.