"We've been in contact and we met up in Ames," McMillen said of Nagel, an uncommitted receiver. "We both loved it. I think he had a good time."
As the first commit in the 2015 class — McMillen and his mother told Paul Rhoads, Wally Burnham and Derek Day over lunch at Saturday they knew Iowa State was the right fit — there's a responsibility for the Naperville (IL) linebacker to draw other talent to Ames.
"[Being the first commit] means a lot," McMillen told AllCyclones.com on Saturday. "It definitely gives me a role to get some of these other recruits in to see the campus and play football at a prestigious school. It definitely puts some weight on my shoulders.
"I wouldn't say it's a job but it gives me a role."
The 6-foot-2 McMillen, who mostly plays middle linebacker in high school, stayed the night in Ames on Friday and took some tours and went to a few player panels before lunch Saturday.
The point man on McMillen's recruitment has been graduate assistant Derek Day.
The Cyclones won out over Western Michigan.
"It's definitely a relief," McMillen said. "Some people say recruiting is a fun time but in my mind it's not. It's a struggle. Yes, you can have fun with it from time to time, but having to tell other schools, 'No,' is not fun. They put their neck on the line to try to get you to play for them.
"But I"ll tell them I've made my decision, that I just felt I was a better fit at Iowa State."
As the bellcow of the class, McMillen's task now becomes making sure other prospects feel the same way.