Actually, it raises the question of what the relationship between The Other and the Order was when it came to developing those wasps. Were wasps extant before Lucrezia? If not, was the Order involved in developing the Slaver wasps? Because if the spark-slaving-wasps are a new design, not a return to an old design, there may have been something in the original design process (or biomaterial) that prevented Sparks from being successfully wasped (though it's never been clear whether attempts to wasp a Spark don't happen, happen but fail, or happen but kill the Spark.)