Hi! I'm also researching the Pinkerton family. I may be able to help you. I have a lot of information on the Pinkertons (mostly from southern Illinois)in which David is a very common name. I have many Davids without a middle name. I would bet that I have the one you're looking for. However, we have to narrow it down. For example, who did he marry? I can also be reached at firstname.lastname@example.org.