Quick question. You can spoiler the answer if necessary, I haven't read the books so I wouldn't know.
Fred Johnson has obviously been linked with the OPA on the show, as has Anderson Dawes on Ceres. Both guys seem high up in the OPA organization, sort of like the "big wigs," so to speak. Who is higher up, though? Does Dawes answer to Johnson in the OPA, or does Johnson answer to Dawes?
Fred Johnson is in charge (de facto leader). And Tycho Station is basically the HQ.