Staffs and Permanents, even Fellows are by and large from Western Europe. In particular senior staff positions (ie. decision making). Just look at any orgchart in any division.
Then we both agree, that jobs are not awarded accorging to the matter of needs, neither merit for that matter. It is about the most funding, which is self-selecting in the long tradition of Western European capital concentration: the first among equals. Makes sense, but contradictory to any publicly stated charter (be it CERN or EU).