She holds the deciding vote, but to suggest they're powerless is untrue. Firstly they were leading campaigners for Brexit, so that whole will of the people nonsense is in their favour. Secondly, they headed up the Brexit-related departments, so 100% of their job was devoted to Brexit versus a much smaller proportion of May's, as she also has the NHS, defence, education etc. to worry about. Thirdly, for pretty much her entire premiership she has been branded as weak and hopeless. Indeed, many have argued that the only reason Johnson hasn't been sacked for his constant sniping is due to her weakness. The notion that she's suddenly become a Thatcher-like ball breaker seems a stretch. Last, but not least, Davis, Johnson, Fox et al campaigned for Brexit so you would hope had a vision for both what it would be, how it would benefit the country, and how it could be delivered. Their very job was to convince the country of that, and negotiate with the EU to ensure it happened. That was their job. No more, no less. The fact that they failed to even convince their own colleagues either suggests they're useless or their visions were useless.
