If he did, it was a university infraction, not an NCAA infraction. This impacted no game and no opponent nor affected recruiting. He could still find himself on academic probation at LSU next semester.
If he did, I hope Miles disciplines him adequately, otherwise the "Miles is such a good man" argument loses a lot of steam in my book.
I am sure he will. Right after he signs his multi million dollar contract with some NFL team. But yes, you are right if he stays, depending on what he did, Miles does need to discipline him. We never really have been told exactly what he did, just something to do with academics and against school and team rules. Don't know how severe it was. On the real positive, it is nice to see the continued above the bar approach the Coach Miles and LSU takes when addressing possible NCAA violations.