I really like this theory. Q said Soros answers to P. If we consider what Soros does, he socially controls millions of people, some paid for, some willing, through strong "ideals." The only person qualified to do this on a larger scale would be the Pope, i.e. the leading the catholic church which effects billions of people on a social scale.
My other thought on this was that C = Chair, and that P is the "Chair" of this cult. Therefore P answers to the Master.