You should look at the map. Val d’Aosta and Trentino-Alto Adige are small underpopulated alpine regions and they mostly produce skiers and winter sports athletes, or cyclists. Molise is also small but on the Apennines, lots of sheeps. From Val d’Aosta the only good player was Sergio Pellissier, from Trentino there’s Pinamonti now and I can’t remember any other players. By memory I don’t remember any players from Molise, I doubt more than a dozen have made it to the serie A.