Assuming he manages to buy 99% of all current eth, he would have more than enough control of POS when the upgrade goes live.
Firstly, this is impossible because the Ether that is already staked cannot be sold. It's locked in the staking contract until a post-PoS upgrade unlocks it, and even then there'll be an exit queue. Of the remaining non-staked Ether there's a lot that simply isn't on the market, it's locked up in other contracts (such as MakerDAO vaults) or is simply being heldl by people who don't want to sell. You can't force someone to sell if they don't want to no matter how much money you have.
Anyway. If someone magically managed to get 99% of the stake despite all that, then they still wouldn't "control PoS". A validator can't do arbitrary things and get away with it. The rest of the blockchain still needs to accept their blocks as valid, if it tries generating invalid blocks it'll be slashed and will rapidly lose the 99% share. The remaining 1% will produce valid blocks and will become very wealthy doing so as the attacker's stake is burned.
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