I don't think there is any complexity as such. It is mostly just that power centralizes. This is hard to argue though since so many people an incentive to believe otherwise. But ask yourself if there is any concrete indication that e.g. the Internet has lead to decentralization? People used to say that companies were too centralized compared to co-operatives. That companies were "one dollar, one vote" instead of "one person, one vote". Today with different class shares most tech companies aren't even "one dollar, one vote". Everything is going the other way.

I think it might be worth considering that there might be some value to be gained by sharing space, rather than just the blind hoarding of power. Which, as you say, most certainly encourages people to accumulate more.