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San Francisco 49ers 2013 roster view: Offensive line

The 2014 offseason is officially underway for the 49ers. Before we get into 2014 preview content, we'll review each of the 49ers position units. We'll break down how they performed in 2013, and their roster status for 2014. We move on to the offensive line.

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Mark J. Rebilas-USA TODAY Sports

The 2013 season is a wrap for the San Francisco 49ers, but before we take the deep dive into free agency and look ahead to 2014, we're going to take an initial look at that season that was for each position group. We've made our way through the offensive skill position players, and today we wrap the offense with a look at the offensive line.

Breaking down the offensive line is going to have to operate a little bit different than the skill position players. With the skill position we have specific stats that give us a little something more with which to work. We can't be completely accurate in assessments without knowing the playbook and specific assignments, but the stats do give us something.

The offensive line does have some individual stats, but a lot of the assessment comes down to how they operate as a unit. With that in mind, I've found some team stats as well as some individual stats for discussion.

Entire offensive line

Football Outsiders
Adjusted Line Yards: 3.57 (29th)
Power Success: 55% (28th)
Stuffed: 24% (29th)
2nd Level Yards: 1.12 (15th)
Open Field Yards: 0.98 (5th)
Adjusted Sack Rate: 7.8% (22nd)

Advanced NFL Stats (stats defined)
OL-WPA: -1.55 (31st)
OL-EPA: -56.2 (32nd)

Pro Football Focus
OL Pass Blocking Efficiency (weighted formula combining sacks, hits and hurries relative to how many snaps an offensive line is in pass protection): 78.2 (12th)

Joe Staley - 16 games | PFF: 4 sacks, 2 hits, 14 hurries allowed; 27.7 overall, 15.0 pass block, 8.5 run block, 3.7 penalty (overall ranked No. 6 among tackles)
2014 status: Signed through 2017 | Base: $2,700,000; Cap: $3,400,000

Mike Iupati - 12 games | PFF: 3 sacks, 3 hits, 19 hurries allowed; -0.4 overall, -8.4 pass block, 7.2 run block, 1.3 penalty (overall ranked No. 35 among guards)
2014 status: Final year of contract | Base: 2,770,500; Cap: $4,425,863

Jonathan Goodwin - 16 games | PFF: 4 sacks, 1 hits, 14 hurries allowed; 5.8 overall, -1.3 pass block, 6.9 run block, 0.2 penalty (overall ranked No. 14 among centers)
2014 status: Unrestricted free agent

Alex Boone - 16 games | PFF: 2 sacks, 3 hits, 22 hurries allowed; -1.9 overall, -4.0 pass block, 3.3 run block, -1.2 penalty (overall ranked No. 41 among guards)
2014 status: Signed through 2015 | Base: $2,000,000; Cap: $2,590,000

Anthony Davis - 16 games | PFF: 5 sacks, 4 hits, 24 hurries allowed; 9.4 overall, 8.8 pass block, -0.4 run block, 1.0 penalty (overall ranked No. 29 among tackles, No. 10 among full-time right tackles)
2014 status: Signed through 2019 | Base: $1,845,600; Cap: $7,532,266

Adam Snyder - 16 games | PFF: 3 sacks, 2 hits, 9 hurries allowed; -0.4 overall, -4.9 pass block, 4.5 run block, 0.0 penalty
2014 status: Final year of contract | Base: $1,000,000; Cap: $1,300,000

Daniel Kilgore - 16 games | PFF: 0 sacks, 0 hits, 1 hurry allowed; 0.9 overall, -0.6 pass block, 1.5 run block, 0.0 penalty
2014 status: Final year of contract | Base: $645,000; Cap: $685,075

Joe Looney - 4 games | PFF: 0.3 overall, 1.4 pass block, -0.4 run block, -0.7 penalty
2014 status: Signed through 2015 | Base: $570,000; Cap: $676,301

Ryan Seymour - Inactive for his 3 games on roster
2014 status: Signed through 2015 | Base/Cap: $495,000

Carter Bykowski - Full season on practice squad
2014 status: Signed through 2015 | Base/Cap: $420,000

Al Netter - 10 games on practice squad
2014 status: Signed through 2015 | Base/Cap: $420,000

Luke Marquardt - Full season on NFI list
2014 status: Signed through 2015 | Base/Cap: $495,000

The various stats looking at the offensive line as a whole are not exactly the most inspiring. Both Football Outsiders and Advanced NFL Stats rank the 49ers far down the list when it come to the ground game. FO ranked the 49ers 28th in power success, which is particularly disappointing given the beef up front. The 49ers pride themselves on being able to come at the opponent with power, and yet they could not find much success with it.

The offensive line was fairly middle of the road when it came to pass protection. There were stretches where Colin Kaepernick seemed to lack time to make plays, but more often than not, he was able to either make the pass from the pocket, or at least get out of the pocket. It's a little more difficult sometimes to assess the line play with a mobile quarterback, but the pass protection seemed to improve as the season wore on. Of course, getting Michael Crabtree back probably helped a little bit!

On the injury front, the 49ers line lost Iupati for four games, but otherwise kept the same unit together. Staley suffered some injuries, but they always ended up less severe than they first appeared. As for Boone, Goodwin and Davis, they never seemed to get banged up, with Boone playing every single offensive snap for the 49ers.

Iupati seems to have the walk of a guy who is perpetually hurt, even though he doesn't have an extensive injury history. As he approaches free agency in the next year, it will be interesting to see what the 49ers decide to do with him. With Alex Boone only signed for one more year after Iupati, I don't know that the 49ers will be able to keep both of them.

Behind Iupati, Boone and Goodwin on the interior of the line were Adam Snyder, Daniel Kilgore and Joe Looney. Snyder remains a serviceable backup option. He had some solid moments, and while he was never overly inspiring, he was useful in a pinch.

Kilgore remained the primary backup at center, but Goodwin's continued good health meant Kilgore saw very little game action at center. Rather, he primarily worked as an extra blocker on heavy sets. Kilgore spent the offseason as the man behind Goodwin, getting first team center snaps when Goodwin stayed home for parts of the offseason workout program.

Joe Looney finally got on to the field this season, making his NFL debut against Washington in Week 12. In Week 13, he had his most extensive playing time of the season. The 49ers were without Mike Iupati at left guard, which meant Adam Snyder got the start. Then, Joe Staley suffered an injury six plays into the game. The 49ers moved Alex Boone from right guard to left tackle, and inserted Looney into the lineup. He played 60 snaps, and while he struggled at times, I also think he showed some things in the run game. I don't know that it was enough to move him further into the rotation, but at least we got to see him on the field!

One of the more interesting players on the roster is Luke Marquardt. The offensive tackle played his college football at Division II Azusa Pacific. He suffered a foot injury prior to the start of the 2012 college football season, and missed the year. He had surgery on his foot shortly before the draft, and then signed with the 49ers as an undrafted free agent. He spent the 2013 season on the Non-Football Injury list, although he did advance to getting in some running by the end of the season.

There is no specific timetable at this point, but the fact that he was back running is obviously a good thing. He is as much a lottery ticket as anything else. There is no reason to think he can't make the transition from D-II to the NFL, but the learning curve will be significant. And foot injuries are always dicey, so we'll see how he develops in the coming year.