nothing moves at all, who told ya that?????
without going into the math just simply look at where the wheel centers in the wheel well on a stock truck and one with 2" leveling spacers, the wheel will be moved off-center of the wheel well and to the rear
following your theory if 2" spacers move nothing than you can put 6" spacers or springs in and nothing moves, right???????????? just not so
anytime you change a suspension part from OEM or OEM replacement parts something moves