On Cameron becoming foreign secretary in House of Lords - if confirmed - there are post-war precedents: Douglas-Home, an ex PM, in 70-74, Carrington under Thatcher. Also significant that Cameron led the campaign against Brexit, and that Cummings would rather stick pins in his eyes than appoint him. So this would be Sunak’s very formal Declaration of independence from his initial patron, Cummings. Also the Brexiter Tory right would hate this appointment. The sacking of Braverman would then look like a Sunak coup against the entire insurgent populist right wing of the modern Tory party