yeah well that's a big issue with his case. he didn't have to
Individually, and in a vacuum, he probably did not.
However, the NBA has (probably rightly) determined that collectively as an organization, it needs
the exposure of NCAA basketball to help create interest in its product by highlighting and exposing upcoming players before they get drafted into local franchises. That is what creates value for those organizations, that in turn and in part is what allows them to pay the salaries they do.
This seems to be the whole trick bag of this situation, and where I think what a lot of these people think they want, would ultimately be a case of killing the goose that lays the golden egg.