You 2 missed the question.
In this system while possible to have one of each, it's much harder to manage which one gets in on the right play. If you are a casual coorinator, your better off with one set or the other, not mixed. If you do you have to manage down and distance play calling in much greater detail, and i would say 80% of teams don't/won't manage it right and would get frustrated watching their powerback get dropped for a lose on a strech run play.
Pick a style and be great at it, not mix would be my option.