During the offseason, there are a lot of moving parts in all of college athletics. You have people graduating, people transferring away, people transferring in, and incoming recruits to keep track of.
In some sports, such as football, there is an enormous amount of information out there. If the Huskers get a football recruit, you know about it right away. If they get a transfer or lose someone to the portal, you know about it.
But in sports without that level of media coverage, such as wrestling, changes to a roster can sometimes happen without anyone really noticing.