Below is a link to an article that includes a map of all the blue chip recruits from the 2016 class. It really shows where the talent is, and isn't. CMC has his 4 hour recruiting circle. In my mind in order to really change ISU's path on the football field he would need to grab 2 or 3 kids in that circle that are on that map. Obviously, you hope that he can stop Arkansas coming into Iowa and getting a good recruit.
http://www.sportsonearth.com/article/163686690/college-football-recruiting-2016-geography-map
http://www.sportsonearth.com/article/163686690/college-football-recruiting-2016-geography-map