To expect two Freshmen to consistently outplay Uhl and Wagner is maybe a little too optimistic. I think that with time, Nunge and Garza will be great players for the University, but they also need time at this level to learn how to be consistent. Sure they'll have moments where they flash great potential, but that will be followed by stretches of silly mistakes and poor defensive positioning. The most to ask from them right now is 5-10 good minutes where they rebound well, play good defense, and learn to develop their unique skill sets. Until then, I trust Wagner and Uhl just as much/more at rebounding and bringing energy than I would either one of the incoming freshman.
So to expect them to be displacing a senior and junior might be a little too much, which is why I would not be opposed to redshirting either one of them. I expect by their junior years they will be very good players, and with a future lineup when Cook is a senior of Garza, Cook, Nunge, Weiskamp, and Bohannon, I can't help but feel very very excited about the trajectory of the program. This will be the Renaissance of Iowa Basketball.