I wonder if there really are still Voidsent still on board. Diablos could have freed the remaining ones imprisoned there after he absconded. After all, why waste perfectly good pawns? I mean, if Scathac was the most powerful Voidsent locked away in there, and Diablos was planning on using her for his own gains, what would he have to fear from the others? Either way, the Ark itself is potentially dangerous enough on its own. If there are still Voidsent napping, that makes it all the worse if something or someone wakes them up.