 Why is Rolf's weapon so valuable in the fights with the Furry?
Sisko Rolf's stocky body was a blur of motion as he cut the rocket jets, doused the twin searchlights, and switched over to the audio beams that served so well on the surface when blind flying was in order. Rolf swung the lax controls over hard as the bursts of fire revealed a looming barrier of stone dead ahead, and then he felt the tough skin of the flyer crumple inward. Toward this barrier the spinner bore him, and Rolf was content to let it move in that direction—from the heights of the wall he could scout out the country beyond. Deftly Rolf nested the spinners again in their pack before he set out toward the heaped-up mass of stone blocks that was the wall.
 It's much more technologically advanced than theirs.
 The Hairy people need all the extra weaponry against the Furry.  He's able to catch the Furry off guard with his expoder.  It's much more technologically advanced than theirs.  He's a skilled marksman and able to hit many targets at once.