My friend Kevin is one of the smartest people I know, hands down. In fact, in many cases, he got awards and honors and he didn't even have to show up for the lectures.
I remember laughing when he asked me for any notes that I had for a class he completely ditched. How can this guy ever pass, much less get an A, when he didn't even bother to show up?
Boy, was I surprised when the guy got better grades than I did. And he didn't cheat. That's how talented Kevin was and still is. But Kevin, just like most people, had a weakness.