Dereck_Oliveira
Even a ordinary human and low level shinigami in Soul Society can tell who they are and what they are just by sensing their reatsu and by just looking at them. So why Kukako Shiba need to ask who they are at what they are? Can't she tell the difference between a hollow, human and the shinigami? If you still don't know, she is one of the most skillful being in Soul Society in terms kido arts, controlling and sensing reatsu. Hollows reatsu are different from the shinigami's reatsu. So if someone as skillful as her can't feel their heavy and dark reatsu or tell that they were a hollow base on their form then, other shinigami won't be able too as well.