Golson, as long as he graduates by the summer, could enroll at USC and play next September. He redshirted his frosh year, played his soph year, suspended his junior year, played his senior year. He has that 5th year left because of his frosh redshirt.
He can now transfer to another school and play immediately for one season if he graduates by the summer. Whether he can grduate by the summer is another question.