I have had very healthy hives with good resources over-winter a few drones. When I see lots of small drones around(and in) a hive in late winter/early spring, I have found that a strong hive lost its queen, over-wintered with a strong enough population to make it, and strong enough to go laying worker when brood ramp up time comes around. Last year was the first time I saw small hive beetles over-wintering in the cluster of bees. I prefer drones.