Chile Verde = No Potatoes. The truest of chile verde recipes would never include potatoes. The starch in the potatoes makes the consistency of your base to thick, when it should be slightly thin, but also hold together. The fat and oil from the meat, and the moisture from the chiles are what make the consistency light but deep.
But, who am I to say! Enjoy the dish any way you like! Props to Chow for the recipe!