"Not entirely, no, a hive ship can be flown by just one wraith." Or one human if you're like Teyla. "At least three in a full out battle are needed, and the drones handle none of that. However, in a battle, the drones are sent out first in the dart ships, and it takes a little time for even them to wake up and come out of hibernation. So if we were to encounter and enemy hive, it's likely we'd have to make a run for it in order to get our drones out of hibernation and into ships before turning around and launching an assault. Its risky, but possible."