Fine, but the "Halfling Thief" and "Dwarf Hammerer" _should_ be regular old NPCs, but we have to guess what class they're supposed to be, the abilities they have aren't found in the classes in the PHB, and if we were interested in making those abilities available to PCs, we'd have to guess what level they should be, since it doesn't say. And they also have a lot fewer abilities than they should, which is much more obvious with the higher level NPCs.