I want to know the answer to the following question:
Were the Ashkenazim thought to be a subset or superset of their assumed geographical source population?
All the background I'm provided with is that "The study also observed that Ashkenazim are more diverse than their Middle Eastern relatives, which was counterintuitive because Ashkenazim are supposed to be a subset, not a superset, of their assumed geographical source population.". Is that enough to answer the question?
Answer: yes