Look at the ages. New cells with eggs, new cells with larvae, new cells with very large larvae, capped white smooth cells, capped darker "filigreed" cells, cells with papery tips. If you have a wide range of ages, they are swarm cells. If they all appear to be somewhat the same age, they are supersedure cells or emergency cells. How many is usually very much a function of the size of the colony. No significance to them being all in the same area. In fact, you may want to look closer, you may be missing some on other combs...