Didn't follow it super well because I was in 8th grade, but I've read quite a bit. I don't recall anything that wouldn't have fallen under one of the exceptions, but perhaps you have something in mind.
And yes, I simplified McQueary's account, but it would in no way be admissable even in a trial where Schiano was a party. McQueary never claimed to have heard it directly from Schiano, and Gus Bradley has steadfastly denied ever telling McQueary any such thing.
That said, the entire idea of Schiano suing is absurd. Who would he have sued? Random fans on the internet? No one at UT ever said anything remotely defamatory.