Sorry about that, I was wrong and looking at the wrong system. Pathfinder stated that wights are spawn until the wight that created them is killed, at which point they become full wights. I thought that it said that they couldn't spawn new wights, but I was mistaken.<br/><br/>Still, locking them away is a population control measure, wights will feed and create new ones, but if the low level troops are locked up, only the top teer are acting and they could go unnoticed (have gone) for weeks.