I don't think your assessment of Tressel's limits is correct. As VP of "student engagement," he can speak to any potential or current student.
Lol, and if he talks to them about playing time or athletics (other than the context of "and here is the student section, don't forget to pick up your complimentary tickets at the student center on or before gameday") the NCAA will laugh at him and say "LOL nope, you knowlingly hired someone who is the subject of a 5-year show cause penalty (and you didn't show cause) and now you're letting him interact with potential/actual student athletes. We'd give you a bowl ban except for that to really matter you'd have to have legitimate hopes of making it to 6-wins, so instead you're getting hit with...."
Also, he's VP of "Strategic Engagement" according to his wikipedia page, which sounds more like gladhanding alumni and donors than it does interacting with students.