See the Hawaii transfer and how it made Norm chow look. This would look even worse since it is actually Andersen's son.
Plus, Bronco and Gary have a decent relationship. No reason to try to ruin that, especially if you can get Wisconsin to come to Provo. Which I think Andersen will want to do so 1)he can recruit here more, and 2)can come home and play in front of family from time to time.