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I agree about Chris Whitty, but that's to not give him some credit... he didn't become CMO by also not being ambitious and political too... that may be driven by bolstering and strengthening health and an introspective ambition and leadership rather than a personal ambition and extroversion... but he's definitely a skilled, calm-headed, clear communicator.
Of the people there are, he's the single best person for that role.
Chris is an academic and doctor and probably operating on 3 hours or sleep a night. He's also shy and private. He's the best mind for the job, but not the best mouthpiece for the policy. It stinks of Boris deferring to experts but wanting to maintain a safe distance if things don't work out.