I have the benefit of being at a school with less recruiting ranking than Iowa, but vastly faster athletes and a recognized offensive innovator. The scheme my school runs is based on getting guys in space by a quick pace and lots of people running really fast from multiple positions. They run wildcat, 5 wide, you name it and rack up mega yards. Two freshmen are the most electric players. Because they are young, the staff designs special plays to get them the ball as they learn the intracacies of the entire playbook.
Iowa is the exact opposite program. Iowa is predicated on running fewer plays, but executing those plays to perfection. This means that either you play guys that have been in the program for a while, or you suffer severe growing pains. It also means when players turn over, you will not have players with experience behind them to take over. Guys that were stuck behind the starters who set through the development process have either left the program, or will likely be passed over for a younger player who will be able to go through the extensive development necessary to play at the necessary level. If that young player isn't there to step in, it means very bad things.
Dallas Clark, Marvin McNutt, Robert Gallery, Ricky Stanzi, Eric Steinbach, Brandon Myers, Sean Considine, Mike Daniels, Babs, King, Kroul, Luebke, Klug... These are all guys that put in their time getting stuck before they eventually developed.
You see the same thing this year with the OLine.
The thing is that sometimes that means you have guys that accompany the young guys as they are developing that are just not that good. We know who they have been over the years. They have been gutty Hawks who have played their hearts out, but just are not good enough.
The difference is that some years these guys are holding down a spot until a guy like Sanders, or Gallery, or Angerer, etc is ready to step in while the other guys are finishing their development, and sometimes they need to step in when they are just beginning. When it's the latter, we get 1999, 2000, 2006, and 2007. When it's the former we get 2001 and 2008.