I liked the way you created an entire conspiracy with the Chinese government at the forefront
. We can speculate that the Chinese government stacked away 100,000 of Bitcoin but what is the point in doing so when they are restricting users for years and there will be an uprising if there is something like this and since you concluded that they are smart, they will not do anything that could create a revolution against the government
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The points you said about Elon, i do accept them because he is smart enough to manipulate the market and he is doing that for years without any repercussions.
Theoretically, a very rich entity could potentially try to centralise Bitcoin via purchasing a large amount of it, and holding it. However, it would probably be far more beneficial for them to buy out existing exchanges, and limit the amount of people that can buy Bitcoin in the first place. Although, a slightly unrelated note, China aren't that cautious against safeguarding against the possibility of a revolution, they censor their citizens already, and limited them in various ways. Also, do remember that China throughout history going all the way back to the Ming/Han days have always imploded due to internal stability rather than outside factors.