I'm coming at it from a different perspective than you, which of course colours my thoughts (and yours).
I don't look at who is in the seat that you seem to think (mistakenly in my view) is the centre of policy and power. I look at what is the consistent policy and strategic thrust and what is happening to achieve that.
Do I believe that fascist behaviours and policies were naturally alighted on by Johnson, and inherited by Sunak (and many more besides) organically as a philosophy with their roots and motivations in clear sight? I do not. I believe that they have intentionally been implemented by a well organised, well funded, well connected policy unit ('think tank', 'cabal', 'conspiracy'). That is why you see a consistency in policy and strategy, despite very different personalities (change the shiny face, when the current shiny face torpedo's the project). It's why non-compliant, non-facist, one nation tories were ruthlessly cleaned out. It's why talentless blatantly morally corrupt individuals, willing to indulge in vile behaviour, rise without trace. I do not assume that this is a philosophical political movement, with the countries best interests at heart, because there is no evidence whatsoever of that, in what they do.
Do I have all the answers about how they are working? no, of course not they are very much better funded than me, with more hands at the wheel, and they are not telling me what they are up to....but they leave footprints....like constituting sage with more behavioural experts than medical ones, during a pandemic killing tens of thousands of, what should be, their citizens. Like demonstrably whipping up hatred, division, and disaffection from 'issues' clearly of their making, observably to prove a distraction and a mandate for what they are obviously actually doing. Which they cannot articulate, because nobody in their right mind would vote for it.
Do I believe that Johnson wrote two pieces and metaphorically tossed a coin over which campaign to support? Not really, he's far too fucking venal and lazy to throw away half of his homework. It's just a better sell, than what the two pieces might actually have been:
'Pro-remain: Clearly in the best interest of the country. My personal belief, where such a thing exists, if putting the country first. Limited scope for personal advancement.'
'Pro-brexshit: Can take the cash from these guys, and might really hit the jackpot.'
So from my perspective there is no working for or against Sunak, (nor truss, nor johnson). There is only working towards the policy objective (destabilise society, to exploit maximum cash from it, while retaining maximum control of all things).
That it isn't scrutinised or called out sufficiently, in my view, is merely a measure of the number of invested parties. Despite being objectively vile, breaking international and uk law, riding roughshod over the constitution, and destroying institutions that provide inertia to them, while defenestrating public services and investing public money in private hands, almost exclusively in the gift of the government (cabinet office, controlled by 'advisors'), they are not called out for actions but frippery ('parties', 'speeding tickets', when they need removing, or putting back in line).
Why? Because scrutiny of the 'thing' in any way, is extremely dangerous to them. Because people might start independently asking very serious questions.
Do I believe that we have been subject to an unprecedented string of terrible mistakes, rather than a consistent guiding policy? I do not.
Do I have all the answers? Of course not.
If I'm plotting to ruin your life, and career, so that I can profit from your misfortune, I'm not going to explicitly tell you exactly what I'm doing. It's up to you to spot it, and do something about it.
You might factor into your thinking that exactly the same destabilising actions and philosophy (policy if you prefer), has emerged in multiple territories, at essentially the same time...utilising the same tactics and fascist ideology, and with known links between them. So not a peculiarly british coup.
I do not subscribe to the view that Sunak is controlling that...any more than I believe that truss or johnson before him was.