User blog comment:Godisme/Kill The Shadow/@comment-893506-20120613192620/@comment-44061-20120613232516

Well they can most likely modify the power to suit their needs, empowering them to do more. It would have to be returnable. A zanpakuto is apart of the shinigami, its powers are the direct personification of a shinigamis power. So it would have to be able to be returned to them.