In this instance we are using the Sheepshank to distribute the shock load of a falling climber around an ice/snow bollard-belay, in the same way the "hip-belt" was employed in Blog-2.
The principle of rope and anchor retrieval remains exactly the same after a safe crossing, with the whole system being pulled in on the "sack-attachment" side of choice.
The one disadvantage of this system is that it requires a shortening of the climbing rope to construct. Any shortening of the climbing rope will of course limit the safety margin of the climber's crevasse-crossing distance. Its advantage is that it requires no equipment, other than the rope.
The amount of rope used to construct the width of a Sheepshank anchor depends entirely on the climber's skill and experience to read the effective snow and ice consistency of the bollard belay.