Right off the bat, you are already ignoring what I said. I never said nepotism and corrpution did not exist in the USSR. I said that power is not class, class is a social relation to ownership of the means of production. Managerial workers are not their own class, just like plumbers are not their own class. You are confusing a type of labor for a relation to ownership, and thus conflate the two into class.
Your next example is again, confusing the nature of the state. Socialism and communism cannot be brought about by a socialist party winning electorally and replacing the state bit by bit into a socialist one via policy. There is no generic "state," there are capitalist states, socialist states, etc, and one state is broken and a new one takes its place through revolution alone.
As for replacing socialist democracy and scientific, planned organization with random lottery, this is a recipe for disaster. A truly democratic society is one where the working class as a whole is organized and capable of electing the best among themselves to higher organs, that can prove themselves through practice to their constituents. This can be organized via a single political party, that being the organization of the most politically developed of the working class.
You are explicitly rejecting a competency-based, democratic selection process with one that results in chaos and an easy-to-manipulate state that the bourgeoisie can overturn incredibly easily. This chaos is the foundation by which the bourgeoisie can bring about their own persistence.
In any case, you are getting into the weeds about a specific form of electoral democracy, while entirely ignoring the nature of class and the state. By your own definitions, you would be creating what you believe to be a ruling class. This is why it's important to actually understand the theory and history you are trying to critique, because all you have done thus far is wax poetic about lottery-based elections while vulgarizing class and the nature of the state.