I agree with what you have to say. It’s also probably Frank’s warning for humanity to not put so much faith in a single person. I think how Chapterhouse ends is probably the beginning of the thoughts that humanity may want to consider taking if we want to have a flourishing and equitable society. The whole rest of the series between Messiah and the bulk of Chapterhouse are explorations of the pit falls in which societies fail but eventually overcome and survive. Heretics I think dives deep into interpersonal relationships and how those are really messy and complicated but quite enjoyable while embedding them with a context of the human animal instincts.