I had literally the same experience a few years ago. I was working at a fine dining restaurant, the dishwasher called out, so the chef happily did both dish and grill. Turned out he was the best dishwasher there. Since then, I've noticed that one invariably cooks as well as they clean.
That is a very odd assertion... if you're a good chef, and have "come up through the ranks", you've probably had to clean up after yourself... but I don't think that means that you can take the dishwasher and make him the head chef. Unless you're watching Ratatouille.
"One day, I walked by the kitchen and noticed it was a huge mess. So I washed the dishes."