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I don't feel like there are that many parallels between Johnson and Cameron despite their very similar backgrounds. Cameron quite bright but lazy / dropout, Johnson thick but carried by a flashy way with words?
I don't remember quite such contempt of standards in public life from Cameron and you got the sense that there was some kind of consistent ideology running through what he and Gideon were trying to do (like their idol Thatcher). Johnson appears to lurch from crisis to crisis with whatever sticking plaster stupid fucking policy he can think of.
I think @christianSpaceman has in mind the culture of privilege and entitlement that the school fosters generally. That headmaster may have seen Johnson for the shit he is, but he probably didn't see how the school's culture made him (and Cameron and the rest) even worse.