49ers vs. Cowboys: Examining San Francisco's allowed sack [GIF]

The San Francisco 49ers have some pretty significant issues along the offensive line. The defensive line isn't in a dire position itself, but the pass-rush also has some question marks. Against the Dallas Cowboys, both lines had their faults. Last season, I made some gifs and did some breakdowns of the sacks allowed by the 49ers, and I intend to do the same thing this season as well.

Fortunately, the 49ers haven't given me much material to work with this week. With Mike Iupati struggling, Daniel Kilgore thrust into a starting role, Joe Looney in place of Alex Boone for whatever reason (punishment, I imagine) and Jonathan Martin in place of Anthony Davis thanks to injury ... I was expecting a disaster.

It wasn't always pretty -- I noticed some serious miscommunication on the right side of the line, Iupati missed multiple assignments and Colin Kaepernick wasn't nearly as comfortable as we'd like him to be back there. But at the end of the day, the 49ers ran the ball well and Kaepernick was only sacked once.

So let's take a look at that sack below:

I've always been of the opinion that Iupati is very good getting over to the right side of the line and making things happen. That opinion has been slowly fading since the latter half of last season. This play was a pretty significant misstep, though they're not usually this bad.

Iupati moves to the right side, and it's clear who he is supposed to be blocking. I'm honestly not sure if he thought that guy wasn't going to be rushing, or if he thought Frank Gore needed help (he didn't), or maybe he thought that Kaepernick had actually handed the ball off or had taken off to the right side himself based on how wide Bruce Carter was going.

Whatever the case, Iupati went to block him, changed his mind and getting to Kaepernick was easy because of that. The 49ers did a very good job of sealing off the other side ... no seriously look at that left side get handled over there. Had Iupati made this block, Kaepernikc might have been able to complete the underneath pass you see near the end of the gif, to Anquan Boldin.

More than likely, Kaepernick could have taken off running for a big gain there.

That's the only sack the 49ers allowed, which is great. I'm a little concerned about Iupati and how the 49ers' offensive line is going to look once he's gone, but he's got all the talent in the world to rebound and shut us up, right? The 49ers themselves had three sacks on the day, and I made some gifs of those, too. You can find the two sacks Justin Smith got in the post here.

He didn't include Ahmad Brooks' post, and while I'm running out of time and won't break it down, I made the gif anyway so here's that: