Any of the 3 would be in federal trouble now.
Side note that's still my biggest complaint in the OJ Mayo and Bush cases, that despite repeated stories that the Feds were getting involved, to date neither one has faced federal charges. Fact is they got money under the table that they didn't declare as income, that's tax evasion. In Mayo's case there was also the very likely situation that he was being paid from a phony charity setup for Sickle Cell Anemia, they were drawing cash from that fund to pay Mayo, which is outright Federal Fraud(the charity had tax exempt status).
If "they" really want to prove they want to get rid of this stuff in college sports pursuing federal charges against guys who get caught is one great way to do it.
What happened to Bush and Mayo is trivial compared to what it could have been if they'd been brought up on Federal charges, there's no logic to why they weren't if an average citizen got tens or hundreds of thousands of dollars he or she didn't declare, the Feds wouldn't let it go.