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Exactly.
She is trying to maintain her power and the party's.
BJ is such an amazing choice for so many political reasons. He appeases the Brexshit wing, while being one of the sacrificial offerings in the event of a Brexit failure.
Importantly giving him a prominent role that he is totally unsuited to gives him the opportunity to showcase his ineptitude to prevent him taking over the party. My guess is that she reasons that eventually he will go too far - a bit like tabloids and phone hacking;
celebs = "oh of course it happens, it's fine they're famous."
parents of missing children = pitchforks
Yet last week she could sack Fallon, although he resigned officially.
Why is she strong enough to sack a senior cabinet minister one week, yet too weak to sack a junior one the next?