There's a lot of work that needs to be done with the D-line. Nebraska has only signed 10 defensive linemen in Frost's 5 recruiting classes. And when you look at the names, really only Ty Robinson and Nash Hutmacher were big gets.
You could use a big class this year between high school kids to plug into your developmental system, and guys like this and through the transfer portal who can fill in for a couple years while guys like Van Poppel and hopefully Caleb Bryant (I wouldn't stop at two HS kids) get developed the next couple years.
Other than Ru’Quan Buckley, the other guys in the system like Marquis Black, Jailen Weaver and Mosai Newsom appear to be busts.