Worthy wanted to enroll early, Michigan wouldn't accept a class from his transcript. So his choices were, not to enroll early, retake the class and then try again in the spring. Texas, who is also an elite academic school, gladly accepted the class and Worthy.
Same thing happened to the basketball team last year -- The top player in the transfer portal from Texas Tech was going to commit to Michigan, only to find out, UM wouldn't accept a lot of his credits from Texas Tech. But Illinois, another elite academic school, gladly accepted him.