If you're Carlsberg and have one single salesperson in a country, these companies let you have a regular employment contact without your own subsidiary. Or you're the UN. Or...
Foundation's 990 (page 8) initially mentions paying 0 for full time work, only later to be explained in supplemental information page that there were in fact paid well high enough.
This could be simply payment structure like you said but their overal financial summary doesn't explain weather this was included in thecost of admin or not.
Page 7 of Form 990 asks for "highest paid employee." including other info where Rust foundation has reported 0 for most people.