Definitely a need at CB. I'd like to see PP pick up two. As it stands now, Iowa really can't afford more than one injury at that position. A multi-year experienced CB or two would really help. That said, I am impressed the way Terry Roberts has performed - he looks like an emerging star at CB.
I don't believe the DL has the same dire need. If either VV or Heflin return, the Hawks should be able to field a very good unit even with Golston and Nixon leaving the program. Waggoner is ripe for a breakthrough. Lorbeck is an experienced DE transfer. Shannon and Evans were rotated this year. Lee, Jones, Bruce, McCall, Craig, Karchinski, and Black - all younger talent with potential to make a significant impact, especially Lee and Jones IMO. Coach Bell has a lot to work with and produced an excellent DL this season.