Lol, a GM in College Football does not do the same thing as GM at the Pro level. GM's in college are at the Beckon Call of the Head Coach. A College GM's role is strictly Adminstrative. They are going to be responsible for the budget, coordinating Logistics, managing all the Support staff, and they will have some oversight into NIL revenue sharing going forward.
The GM isn't calling the shots about the choice of players or roster development. That's still up to Rhule and his staff. Now, Dr. Elza and Padden do handle some work "vetting" players. Rhule and staff might say, "we like this athlete and think his talent is sufficient." The GM and staff will then contact former coaches, teachers, even janitors to find out if the player is an asshole or a good fit.
Nebraska already has a scouting staff led by Jamar Mozee. He has a pretty extensive network nationwide. His group will identify a player. Rhule and the staff will then determine if they want to recruit the kid. The GM team doesn't really hop on board until after an offer is made and they are ready to talk money.