There are universities and colleges that do not have "special admissions" for athletes. Wisconsin is one of them. Any potential athlete, who has not completed the core curriculum as prescribed by these schools is not eligible for entry into school, so therefore ineligible to be given a scholarship. This is often reflected in the percentage of applications that are accepted.
As an example, Northwestern is the toughest school in the Big 10 to get in. It's about 7 or 8% of applicants that make it. That means a huge number of potential athletes will never be offered, even if they are at the top of their high school's honors list, unless they have completed the core class requirements, have a high GPA, and qualify highly in ACT/SAT testing.
Wisconsin, along with all schools in the Big 10, have high standards. Even though, there are some schools that have been known to find ways for potential athletes to attend summer schools, and academies, for a semester, or year, to get the athlete eligible.
The Big 10 wouldn't consider several schools that were interested in joining, because they didn't meet the standards. There's a name for the group they're in, but can't remember what it's called.