Seems pretty likely that the Huskers found out about a positive COVID test shortly after the Monday presser right before they were supposed to leave for Purdue. Because of the tight timeline and not being able to do all the contact tracing, they just had to postpone the game. Didn't practice for a couple days earlier.
Don't know who it is but it sounds like someone who is definitely in the rotation. Which means we'll probably find out when they're not playing in the next game.