No one has full control, but someone can manipulate the price especially those who have a big volume of holdings. They could make the price suddenly drop. This big holders of the whales might be a syndicate that wants to take advantage of the current run. Their manipulation Might affect the price but for only the short term. They still can fully control it.
There is the sense in your statements. No one has a pointer in controlling Bitcoin. But there is some fraction on these big holders. I guess there is one additional fact, it is the government. Any government can ban Bitcoin at any moment. This is also a means to control.