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Michael Zordich 1, Dominic Alvis 0
In 2012, the Iowa defense registered 13 sacks, which was tied for 115th in the country.
Much of the problem had to do with defensive ends, or more appropriately, lack of playmaking ends.
The Hawkeyes are not a blitz-heavy team. Consequently, the defensive scheme requires a line that can generate a pass rush without extra pressure.
On the bright side, there were some flashes of hope from the defensive tackles. Neither Louis Trinca-Pasat nor Darian Cooper registered a sack in 2012, but both regularly got penetration. As Hawkeye Gamefilm on HawkeyeNation reported around midseason last year, "Overall this group has really come together and is getting the job done."
They weren't as dominant as the season wore on, but that had to be expected from a young group.
On the other hand, there is little to be positive about when it comes to the ends.
Joe Gaglione, the only end who got any penetration last year, graduated. The other starter, Dominic Alvis, will return, but with 21 starts and only 5.5 sacks and 9.5 tackles for loss to his name, it's hard to get excited about the senior from Logan.
Otherwise, Iowa's prospects at end include a number of lightly recruited sophomores who have yet to distinguish themselves on the college gridirons.
As BHGP noted, years of attrition have taken their toll on the Hawks.
The best Iowa defenses under Kirk Ferentz always had a few things in common. One of those things was elite, athletic defensive ends. It was Matt Roth in 2003 and 2004 and Adrian Clayborn between 2008 and 2010.
Unless it finds such a defensive end, the 2013 Iowa defense will have a decidedly limited ceiling.