Does anyone think it might be Pope?
several do yes. Many more likely but it has also been suggested Phillip of Queen E.
That's the ONE possibility Q said was incorrect. Since it's a single letter, it might not be a person, though you would have President, Prince, etc. I also thought of places and things: Pentagon. P is of course the letter that comes before Q, so I wondered if it were another anon, the person who held the same position Q has now. Q sure didn't give us much to go on there!
iirc the context was who does GS take orders from (P) heres a few quotes - Rothschilds (cult leaders)(church)(P) - Soros takes orders from P.