So... what I don't understand about all of this is: CHAKRA COST. Exactly how much chakra must Kabuto have in order to maintain all of these bodies? Is he making them function on their own chakra reserves (and how is that possible if they're dead?), or is he sustaining them all by his own chakra? Considering how some of the techniques used by the ninja he revived are heavily chakra-intensive, does that mean that Kabuto's going to run out of chakra soon if he runs them all at the same time, or that there's some sort of limit to their powers/techniques? Or is the concept of chakra sacrificed on the altar of epic coolness?