I am not sure I agree that there were a bunch more serious issues. I am not trying to argue; just pick your brain. With respect to the old flights, there was nothing else-- just the expired medical issue. With respect to the recent flights, it was just an issue of whether a medical was necessary, and no properly logged BFR. Maybe by serious, you mean he bent metal. So you put it all together and it adds up to serious. As Mark noted, these issues usually come to the FAA's attention when incidents such as this occur.