I can't help but think that Stember had a bad day.
Since this was a one-off race, I don't know if it's fair to judge...maybe he had a cold or some other ailment, or maybe he had to pull late hours at work for a week to meet a deadline.
Even I can run a 19:30, and I'm way older than Stember, don't train for the 5k, and am probably way higher BMI than him.
To insideinfo: the "average (American) guy" will not even be able to run 5k at all. I just flew across the country and saw a cross-section of the American public...oh god...
I'm blown away that Stember couldn't go faster than 19:30
We'll see what happens next time, if there is a next time...