What?! With that argument you can say that every coin with premine is "controlled"
There have been hundred of thousends $ worth of Dero traded in the last days. That is not enough Dero for you? Keep in mind that the price is very low (mcap of ~4mil) and thus very few people are willing to part with their Dero, they expect them to be worth more in the future. If you offer a higher buy price, more people will be willing to sell their Dero.