It may be useful for Sunak to have her in place to blame if it is ruled illegal.
The opposite I would have thought. With the court ruling that it is illegal and her already gone he could have reasonably said that there is nothing left to discuss. Issue closed.
But if she is still at her job it will just be another headache for him to deal with, even if he eventually has no alternative but to sack her.
By criticizing the police is an institution, ie they allegedly discriminate against right-wingers, Braverman gave Rishi Sunak an open goal.
Criticizing the BBC, immigrants, those living in destitution, left-wing lawyers, etc, etc, might chime with certain sections of the Tory Party, but attacking the police certainly doesn’t.
I just can’t imagine that attacking the police will have gone down well with the Tory faithful.
The problem imo is that Sunak totally screwed-up and instead of emphasizing his faith in the police, and sacking his Home Secretary for making disgraceful comments, he actually joined in the criticism and said that he would personally hold the Metropolitan Police Commissioner responsible for not doing what Braverman requested if anything goes wrong.