I want to know how you isolate a node A, that is honest
You make a holistic assumption about the economics which I can't even make. Again see my point about undersupplied good and the ability to bribe nodes. I mean every one is participating in consensus "mining" (or what ever you want to call it) to earn the most they can for themselves. Until we know well the holistic economics game theory of your complex design, it is not really possible to even reason about what 'honest' means. It isn't dishonest to maximize my profit.
I thought you were going to let me leave the thread with my gracious comment that my comments were speculative only.
But since you insist, I guess I have to become more forceful than I wanted to.