Control can be of different kind: setting an exact price is a direct control but it gives not so much if you are trying to earn on that. Making others to support the trend you need is much better but you still need to be an owner of too big part of a market. Seeing the global trends and manipulating with them making others to slow down or speed up those trends in a market much bigger then your own assets can bring you much more and still be a kind of control.

And those ones who can do that and understand how to do that are real whales unlike you and me.