This is a tough one -- I just adopted a couple thinking that merging would be a good idea, but then I had second thoughts.
Instead, I think a little research could identify whether or not there are duplicates among the Unknowns and the named children, and the merges could be done that way instead.
I just don't think it's a good idea to do a bunch of merges without knowing what the ultimate outcome should be.
Does that make sense??