Having staggered fitment means you cannot rotate the tires around without swaping the tires rims to rim which would mean you have to pay someone to remount and balance your tires everytime you rotate them, or you do not rotate them and then they wearout quickly, very quickly on the fronts.
Unless he doesn't care if the wider wheels/tires are on the front and the skinnier on the rear when he rotates them and vice versa. And he can do side to side unless they're rotational tires.