That's true of any society, for the most part. Socialist countries do end up doing this much better than peer countries though. Also, in socialism, the working class is in power. Administrative positions exist, but they aren't unaccountable or anything.

Isn’t that the same concentration of power?

Not at all. Collectivization of production and distribution into one democratically run system does naturally follow from the groundwork paved by late stage capitalism, yes, but this collectivization also brings with it democratization of power.

Only in global communism. The charged workers don’t have to be the same as the producing workers.

I don't see how this relates to communism, moreover the working class as a whole is the class that produces and consumes. The company towns only worked somewhat because the commodities they produced were sold outside, making everything a company town wouldn't work.

I know. It could be futile to wait for the collapse.

Still don't see your point.

There can be circulation. People earn wages and buy commodities. It’s like socialism, just people get less because the capitalist get’s more than everybody else.

Not at all. Buying goods with money earned isn't the same as circulation of capital. Capital transmogrifies from money to productive commodities to produced commodities back into money in a grand expanding circuit, but without such a system you no longer have capitalism, and prices collapse. This "mega-capitalist" would be overthrown instantly and socialism or barbarism would take its place.

If all resources are available there is no need to sell abroad, or to buy fron there.

There is for profit. You're trying to create a weird utopian mega-capitalism that would, the instant it existed, collapse into socialism or barbarism.

Why is that inevitable?

A single person can't actually own the entire economy. They would be ousted instantly. This is the same kind of utopian thinking that powers anarcho-capitalists.

Why rely on it instead of building a ‘we’ on its own?

We don't, we rely on organizing. Capitalism's decay speeds up that process.